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For example, model providers require credits to use their LLMs."}),"\n"]}),"\n",(0,s.jsx)(n.h2,{id:"langflow-installation-issues",children:"Langflow installation issues"}),"\n",(0,s.jsx)(n.p,{children:"The following issues can occur when installing Langflow."}),"\n",(0,s.jsx)(n.h3,{id:"langflow-installation-freezes-at-pip-dependency-resolution",children:"Langflow installation freezes at pip dependency resolution"}),"\n",(0,s.jsxs)(n.p,{children:["Installing Langflow OSS with ",(0,s.jsx)(n.code,{children:"pip install langflow"})," slowly fails with this error message:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"pip is looking at multiple versions of <> to determine which version is compatible with other requirements. This could take a while.",props:{}}]}],lang:"text"},annotations:[]}]}),"\n",(0,s.jsxs)(n.p,{children:["To work around this issue, install Langflow with ",(0,s.jsx)(n.code,{children:"uv"})," instead of ",(0,s.jsx)(n.code,{children:"pip"}),", as explained in ",(0,s.jsx)(n.a,{href:"/get-started-installation#install-and-run-the-langflow-oss-python-package",children:"Install and run the Langflow OSS Python package"}),"."]}),"\n",(0,s.jsx)(n.h3,{id:"linux-installation-fails-to-build-required-package",children:"Linux installation fails to build required package"}),"\n",(0,s.jsx)(n.p,{children:"When you try to install Langflow OSS on Linux, installation fails because of outdated or missing packages:"}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"Resolved ",props:{style:{color:"#FFA657"}}},{content:"455 ",props:{style:{color:"#79C0FF"}}},{content:"packages in ",props:{style:{color:"#A5D6FF"}}},{content:"18.92s",props:{style:{color:"#79C0FF"}}}]},{tokens:[{content:" \xd7 ",props:{style:{color:"#FFA657"}}},{content:"Failed to build `",props:{style:{color:"#A5D6FF"}}},{content:"webrtcvad",props:{style:{color:"#C9D1D9"}}},{content:"=",props:{style:{color:"#FF7B72"}}},{content:"=",props:{style:{color:"#A5D6FF"}}},{content:"2.0.10",props:{style:{color:"#79C0FF"}}},{content:"`",props:{style:{color:"#A5D6FF"}}}]},{tokens:[{content:" \u251c\u2500\u25b6",props:{style:{color:"#FFA657"}}},{content:" The build backend returned an error",props:{style:{color:"#A5D6FF"}}}]},{tokens:[{content:" \u2570\u2500\u25b6",props:{style:{color:"#FFA657"}}},{content:" Call to `setuptools.build_meta:__legacy__.build_wheel` ",props:{style:{color:"#A5D6FF"}}},{content:"failed",props:{style:{color:"#FFA657"}}},{content:" (exit status: ",props:{style:{color:"#A5D6FF"}}},{content:"1",props:{style:{color:"#79C0FF"}}},{content:")",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsx)(n.p,{children:"To resolve this error, install the required build dependencies, and then retry the Langflow installation:"}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"sudo ",props:{style:{color:"#FFA657"}}},{content:"apt-get update",props:{style:{color:"#A5D6FF"}}}]},{tokens:[{content:"sudo ",props:{style:{color:"#FFA657"}}},{content:"apt-get install build-essential python3-dev",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsxs)(n.p,{children:["If upgrading your packages doesn't fix the issue, install ",(0,s.jsx)(n.code,{children:"gcc"})," separately, and then retry the Langflow installation:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"sudo ",props:{style:{color:"#FFA657"}}},{content:"apt-get install gcc",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsxs)(n.h3,{id:"installation-failure-from-webrtcvad-package",children:["Installation failure from ",(0,s.jsx)(n.code,{children:"webrtcvad"})," package"]}),"\n",(0,s.jsxs)(n.p,{children:["If you experience an error from the ",(0,s.jsx)(n.code,{children:"webrtcvad"})," package, run ",(0,s.jsx)(n.code,{children:"uv pip install webrtcvad-wheels"})," in your virtual environment, and then retry the Langflow installation."]}),"\n",(0,s.jsx)(n.h3,{id:"c-build-tools-required-for-langflow-desktop-on-windows",children:"C++ build tools required for Langflow Desktop on Windows"}),"\n",(0,s.jsxs)(n.p,{children:["Microsoft Windows installations of Langflow Desktop require a C++ compiler that may not be present on your system. If you receive a ",(0,s.jsx)(n.code,{children:"C++ Build Tools Required!"})," error, follow the on-screen prompt to install Microsoft C++ Build Tools, or ",(0,s.jsx)(n.a,{href:"https://visualstudio.microsoft.com/downloads/",children:"install Microsoft Visual Studio"}),"."]}),"\n",(0,s.jsx)(n.h2,{id:"langflow-startup-issues",children:"Langflow startup issues"}),"\n",(0,s.jsx)(n.p,{children:"The following issues can occur when attempting to start Langflow."}),"\n",(0,s.jsxs)(n.h3,{id:"no-langflow__main__-module",children:["No ",(0,s.jsx)(n.code,{children:"langflow.__main__"})," module"]}),"\n",(0,s.jsxs)(n.p,{children:["When you try to run Langflow with the command ",(0,s.jsx)(n.code,{children:"langflow run"}),", you encounter the following error:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:">",props:{style:{color:"#FF7B72"}}},{content:" No module named ",props:{style:{color:"#C9D1D9"}}},{content:"'langflow.__main__'",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsx)(n.p,{children:"To resolve this issue, try the following:"}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsxs)(n.li,{children:["Run ",(0,s.jsx)(n.code,{children:"uv run langflow run"})," instead of ",(0,s.jsx)(n.code,{children:"langflow run"}),"."]}),"\n",(0,s.jsxs)(n.li,{children:["If that doesn't work, reinstall the latest Langflow version with ",(0,s.jsx)(n.code,{children:"uv pip install langflow -U"}),"."]}),"\n",(0,s.jsxs)(n.li,{children:["If that doesn't work, reinstall Langflow and its dependencies with ",(0,s.jsx)(n.code,{children:"uv pip install langflow --pre -U --force-reinstall"}),"."]}),"\n"]}),"\n",(0,s.jsx)(n.h3,{id:"langflow-runtraceback",children:"Langflow runTraceback"}),"\n",(0,s.jsxs)(n.p,{children:["When you try to run Langflow using the command ",(0,s.jsx)(n.code,{children:"langflow run"}),", you encounter the following error:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:">",props:{style:{color:"#FF7B72"}}},{content:" langflow runTraceback (",props:{style:{color:"#C9D1D9"}}},{content:"most ",props:{style:{color:"#FFA657"}}},{content:"recent call last",props:{style:{color:"#A5D6FF"}}},{content:"): File ",props:{style:{color:"#C9D1D9"}}},{content:'".../langflow"',props:{style:{color:"#A5D6FF"}}},{content:", line 5, ",props:{style:{color:"#C9D1D9"}}},{content:"in <",props:{style:{color:"#FF7B72"}}},{content:"module",props:{style:{color:"#C9D1D9"}}},{content:">",props:{style:{color:"#FF7B72"}}},{content:" from langflow.__main__ import mainModuleNotFoundError: No module named ",props:{style:{color:"#C9D1D9"}}},{content:"'langflow.__main__'",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsx)(n.p,{children:"There are two possible reasons for this error:"}),"\n",(0,s.jsxs)(n.ul,{children:["\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.strong,{children:"Multiple Langflow installations"}),": You installed Langflow using ",(0,s.jsx)(n.code,{children:"pip install langflow"})," but you already had a previous version of Langflow installed in your system. In this case, you might be running the wrong executable."]}),"\n",(0,s.jsxs)(n.p,{children:["To solve this issue, run the correct executable by running ",(0,s.jsx)(n.code,{children:"python -m langflow run"})," instead of ",(0,s.jsx)(n.code,{children:"langflow run"}),"."]}),"\n",(0,s.jsxs)(n.p,{children:["If that doesn't work, try uninstalling and reinstalling Langflow with ",(0,s.jsx)(n.code,{children:"uv pip install langflow --pre -U"}),"."]}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.strong,{children:"Version conflict during installation"}),": Some version conflicts might have occurred during the installation process. To resolve this issue, reinstall Langflow and its dependencies by running ",(0,s.jsx)(n.code,{children:"python -m pip install langflow --pre -U --force-reinstall"}),"."]}),"\n"]}),"\n"]}),"\n",(0,s.jsx)(n.h3,{id:"environment-variables-not-available-from-terminal",children:"Environment variables not available from terminal"}),"\n",(0,s.jsxs)(n.p,{children:["Environment variables set in your terminal aren't automatically available to GUI-based applications like Langflow Desktop when launched through the Finder or the Start Menu.\nTo set environment variables for Langflow Desktop, see ",(0,s.jsx)(n.a,{href:"/environment-variables#set-environment-variables-for-langflow-desktop",children:"Set environment variables for Langflow Desktop"}),"."]}),"\n",(0,s.jsx)(n.h3,{id:"access-langflow-desktop-startup-logs",children:"Access Langflow Desktop startup logs"}),"\n",(0,s.jsxs)(n.p,{children:["If you encounter issues with Langflow Desktop, you might need to ",(0,s.jsx)(n.a,{href:"/logging#desktop-logs",children:"access Langflow Desktop startup logs"})," for debugging."]}),"\n",(0,s.jsx)(n.h3,{id:"user-not-found-or-inactive-when-running-multiple-flows",children:"User not found or inactive when running multiple flows"}),"\n",(0,s.jsxs)(n.p,{children:["When running multiple local Langflow OSS instances on different ports, such as ",(0,s.jsx)(n.code,{children:"localhost:7860"})," and ",(0,s.jsx)(n.code,{children:"localhost:7861"}),", you might see authentication errors in the logs.\nFor example:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"[07/22/25 10:57:07] INFO 2025-07-22 10:57:07 - INFO - utils - User not found or inactive.",props:{}}]}],lang:"text"},annotations:[]}]}),"\n",(0,s.jsx)(n.p,{children:"To resolve this error, use separate browser instances or browser profiles to access each Langflow instance."}),"\n",(0,s.jsx)(n.h3,{id:"package-is-not-installed",children:"Package is not installed"}),"\n",(0,s.jsx)(n.p,{children:"In Langflow OSS, you can follow the error message's instructions to install the missing dependency."}),"\n",(0,s.jsxs)(n.p,{children:["To manage dependencies in Langflow Desktop, see ",(0,s.jsx)(n.a,{href:"/install-custom-dependencies#langflow-desktop",children:"Install custom dependencies in Langflow Desktop"}),"."]}),"\n",(0,s.jsx)(n.h2,{id:"langflow-upgrade-issues",children:"Langflow upgrade issues"}),"\n",(0,s.jsx)(n.p,{children:"The following issues can occur when upgrading your Langflow version."}),"\n",(0,s.jsxs)(n.p,{children:["For information about managing Langflow versions, see ",(0,s.jsx)(n.a,{href:"/get-started-installation",children:"Install Langflow"}),"."]}),"\n",(0,s.jsx)(n.h3,{id:"something-went-wrong-running-migrations",children:"Something went wrong running migrations"}),"\n",(0,s.jsxs)(n.p,{children:["The following error can occur during Langflow upgrades when the new version can't override ",(0,s.jsx)(n.code,{children:"langflow-pre.db"})," in the Langflow cache folder:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:">",props:{style:{color:"#FF7B72"}}},{content:" Something went wrong running migrations. Please, run ",props:{style:{color:"#C9D1D9"}}},{content:"'langflow migration --fix'",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsxs)(n.p,{children:["To resolve this error, clear the cache by deleting the contents of your Langflow cache folder.\nThe filepath depends on your operating system, installation type, and configuration options.\nFor more information and default filepaths, see ",(0,s.jsx)(n.a,{href:"/memory",children:"Memory management options"}),"."]}),"\n",(0,s.jsx)(n.admonition,{type:"danger",children:(0,s.jsx)(n.p,{children:"Clearing the cache erases your settings.\nIf you want to retain your settings files, create a backup of those files before clearing the cache folder."})}),"\n",(0,s.jsx)(n.h3,{id:"langflow-desktop-says-it-is-running-the-latest-version-but-it-is-actually-behind",children:"Langflow Desktop says it is running the latest version, but it is actually behind"}),"\n",(0,s.jsx)(n.p,{children:"If you are running Langflow Desktop version 1.4.2 or earlier, the UI might incorrectly report that you are on the latest version when a newer version is available."}),"\n",(0,s.jsx)(n.p,{children:"This happens because the automatic update feature in the UI was introduced in version 1.4.2.\nEarlier versions can't automatically detect or apply updates."}),"\n",(0,s.jsxs)(n.p,{children:["To resolve this issue, uninstall Langflow Desktop, and then ",(0,s.jsx)(n.a,{href:"https://langflow.org/desktop",children:"download and install the latest version of Langflow Desktop"}),"."]}),"\n",(0,s.jsx)(n.h3,{id:"422-error-when-freezing-components-after-upgrading-pydanticfastapi-dependencies",children:"422 error when freezing components after upgrading Pydantic/FastAPI dependencies"}),"\n",(0,s.jsx)(n.p,{children:"If you locally upgrade your Pydantic and FastAPI dependencies, you may encounter a 422 error when trying to freeze components."}),"\n",(0,s.jsx)(n.p,{children:"This error occurs due to changes in how request bodies are handled in newer versions of these dependencies."}),"\n",(0,s.jsx)(n.p,{children:"If you're experiencing this issue, update your Langflow installation to version 1.6.5 or later, which includes a fix for this issue."}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"uv ",props:{style:{color:"#FFA657"}}},{content:"pip install langflow ",props:{style:{color:"#A5D6FF"}}},{content:"-U",props:{style:{color:"#79C0FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsx)(n.h2,{id:"langflow-uninstall-issues",children:"Langflow uninstall issues"}),"\n",(0,s.jsx)(n.p,{children:"The following issues can occur when uninstalling Langflow."}),"\n",(0,s.jsx)(n.h3,{id:"dot-directory-isnt-deleted-when-uninstalling-langflow-desktop-on-macos",children:"Dot directory isn't deleted when uninstalling Langflow Desktop on macOS"}),"\n",(0,s.jsxs)(n.p,{children:["On macOS, uninstalling Langflow Desktop deletes the ",(0,s.jsx)(n.code,{children:".app"})," file but doesn't delete files in ",(0,s.jsx)(n.code,{children:"~/.langflow"}),", which includes files generated during usage like cache and settings."]}),"\n",(0,s.jsx)(n.p,{children:"If you reinstall Langflow Desktop, it starts with the existing data from the previous installation."}),"\n",(0,s.jsxs)(n.p,{children:["To fully remove a Langflow Desktop macOS installation, you must also delete ",(0,s.jsx)(n.code,{children:"~/.langflow"}),":"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"rm ",props:{style:{color:"#FFA657"}}},{content:"-rf ",props:{style:{color:"#79C0FF"}}},{content:".langflow",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsx)(n.h2,{id:"mcp",children:"Langflow MCP issues"}),"\n",(0,s.jsx)(n.p,{children:"The following issues can occur when using Langflow as an MCP server or client."}),"\n",(0,s.jsx)(n.h3,{id:"claude-for-desktop-doesnt-use-mcp-server-tools-correctly",children:"Claude for Desktop doesn't use MCP server tools correctly"}),"\n",(0,s.jsxs)(n.p,{children:["If Claude for Desktop doesn't use your server's tools correctly, try explicitly defining the path to your local ",(0,s.jsx)(n.code,{children:"uvx"})," or ",(0,s.jsx)(n.code,{children:"npx"})," executable file in the ",(0,s.jsx)(n.code,{children:"claude_desktop_config.json"})," configuration file:"]}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["To find your ",(0,s.jsx)(n.code,{children:"uvx"})," path, run ",(0,s.jsx)(n.code,{children:"which uvx"}),"."]}),"\n",(0,s.jsxs)(n.p,{children:["To find your ",(0,s.jsx)(n.code,{children:"npx"})," path, run ",(0,s.jsx)(n.code,{children:"which npx"}),"."]}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["In your ",(0,s.jsx)(n.code,{children:"claude_desktop_config.json"})," file, add the path to your Langflow MCP server configuration, as shown in the following examples."]}),"\n",(0,s.jsxs)(l.A,{children:[(0,s.jsx)(a.A,{value:"uvx",label:"uvx",default:!0,children:(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"{",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "mcpServers"',props:{style:{color:"#7EE787"}}},{content:": {",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "PROJECT_NAME"',props:{style:{color:"#7EE787"}}},{content:": {",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "command"',props:{style:{color:"#7EE787"}}},{content:": ",props:{style:{color:"#C9D1D9"}}},{content:'"PATH_TO_UVX"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "args"',props:{style:{color:"#7EE787"}}},{content:": [",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "mcp-proxy"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "http://LANGFLOW_SERVER_ADDRESS/api/v1/mcp/project/PROJECT_ID/streamable"',props:{style:{color:"#A5D6FF"}}}]},{tokens:[{content:" ]",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:" }",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:" }",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:"}",props:{style:{color:"#C9D1D9"}}}]}],lang:"json"},annotations:[]}]})}),(0,s.jsx)(a.A,{value:"npx",label:"npx",children:(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"{",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "mcpServers"',props:{style:{color:"#7EE787"}}},{content:": {",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "PROJECT_NAME"',props:{style:{color:"#7EE787"}}},{content:": {",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "command"',props:{style:{color:"#7EE787"}}},{content:": ",props:{style:{color:"#C9D1D9"}}},{content:'"PATH_TO_NPX"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "args"',props:{style:{color:"#7EE787"}}},{content:": [",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "-y"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "supergateway"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "--sse"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "http://LANGFLOW_SERVER_ADDRESS/api/v1/mcp/project/PROJECT_ID/streamable"',props:{style:{color:"#A5D6FF"}}}]},{tokens:[{content:" ]",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:" }",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:" }",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:"}",props:{style:{color:"#C9D1D9"}}}]}],lang:"json"},annotations:[]}]})})]}),"\n"]}),"\n"]}),"\n",(0,s.jsx)(n.h3,{id:"mcp-browser-based-flows-dont-open-a-browser-on-windows",children:"MCP browser-based flows don't open a browser on Windows"}),"\n",(0,s.jsx)(n.p,{children:"This is a known issue when using MCP Tools with browser navigation actions, such as Playwright, on Windows: The agent can execute the tool successfully but the browser tab or window doesn't open."}),"\n",(0,s.jsx)(n.p,{children:"This issue occurs because the MCP server runs from a Python process, which prevents it from opening browser windows in WSL or Windows."}),"\n",(0,s.jsxs)(n.p,{children:["To work around this issue, use the standalone MCP server approach documented in the ",(0,s.jsx)(n.a,{href:"https://github.com/microsoft/playwright-mcp?tab=readme-ov-file#standalone-mcp-server",children:"Playwright MCP repository"}),".\nAfter the server is up and running, you can add it as an HTTP/SSE server in Langflow."]}),"\n",(0,s.jsx)(n.p,{children:"For other browser navigation tools, see the provider's documentation for specific troubleshooting guidance."}),"\n",(0,s.jsx)(n.h3,{id:"no-tools-or-prompts-connected-on-mcp-servers-in-mixed-windowswsl-environments",children:'"No tools or prompts connected" on MCP servers in mixed Windows/WSL environments'}),"\n",(0,s.jsx)(n.p,{children:'If you encounter "No tools or prompts connected" errors or connection failures when using Langflow Desktop as an MCP server with clients running in different environments, such as Langflow on a Windows host and an MCP client in WSL, this is due to network isolation between Windows and WSL environments.'}),"\n",(0,s.jsxs)(n.p,{children:["WSL cannot directly access Windows localhost services, and Langflow running on a Windows host is not accessible from WSL clients at ",(0,s.jsx)(n.code,{children:"localhost:7860"}),"."]}),"\n",(0,s.jsx)(n.p,{children:"To work around this issue, run the server and host in the same operating environment."}),"\n",(0,s.jsxs)(n.p,{children:["Alternatively, configure Langflow Desktop to accept connections from WSL at the default Windows IP address of ",(0,s.jsx)(n.code,{children:"10.255.255.254:7860"})," instead of ",(0,s.jsx)(n.code,{children:"localhost"}),"."]}),"\n",(0,s.jsx)(n.h2,{id:"token-length-limit-errors-in-embedding-model-components",children:"Token length limit errors in Embedding Model components"}),"\n",(0,s.jsxs)(n.p,{children:["Token length errors can happen if your chunking strategy doesn't align with your embedding model's tokenization limits.\nFor more information, see ",(0,s.jsx)(n.a,{href:"/split-text#chunk-size",children:"Tokenization errors due to chunk size"}),"."]}),"\n",(0,s.jsx)(n.h2,{id:"document-processing-errors-in-docker-containers",children:"Document processing errors in Docker containers"}),"\n",(0,s.jsxs)(n.p,{children:["If you're running Langflow in a Docker container, you might encounter errors when using components that handle files or images, such as the ",(0,s.jsxs)(n.a,{href:"/read-file",children:[(0,s.jsx)(n.strong,{children:"Read File"})," component"]})," or ",(0,s.jsxs)(n.a,{href:"/bundles-docling",children:[(0,s.jsx)(n.strong,{children:"Docling"})," components"]}),". To resolve these errors, you might need to install additional system dependencies."]}),"\n",(0,s.jsx)(n.p,{children:"When running Langflow in a Linux-based Docker container, Docling requires system libraries that aren't included in the base Docker image. 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funds in the account to execute the required action. For example, model providers require credits to use their LLMs."}),"\n"]}),"\n",(0,s.jsx)(n.h2,{id:"langflow-installation-issues",children:"Langflow installation issues"}),"\n",(0,s.jsx)(n.p,{children:"The following issues can occur when installing Langflow."}),"\n",(0,s.jsx)(n.h3,{id:"langflow-installation-freezes-at-pip-dependency-resolution",children:"Langflow installation freezes at pip dependency resolution"}),"\n",(0,s.jsxs)(n.p,{children:["Installing Langflow OSS with ",(0,s.jsx)(n.code,{children:"pip install langflow"})," slowly fails with this error message:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"pip is looking at multiple versions of <> to determine which version is compatible with other requirements. This could take a while.",props:{}}]}],lang:"text"},annotations:[]}]}),"\n",(0,s.jsxs)(n.p,{children:["To work around this issue, install Langflow with ",(0,s.jsx)(n.code,{children:"uv"})," instead of ",(0,s.jsx)(n.code,{children:"pip"}),", as explained in ",(0,s.jsx)(n.a,{href:"/get-started-installation#install-and-run-the-langflow-oss-python-package",children:"Install and run the Langflow OSS Python package"}),"."]}),"\n",(0,s.jsx)(n.h3,{id:"linux-installation-fails-to-build-required-package",children:"Linux installation fails to build required package"}),"\n",(0,s.jsx)(n.p,{children:"When you try to install Langflow OSS on Linux, installation fails because of outdated or missing packages:"}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"Resolved ",props:{style:{color:"#FFA657"}}},{content:"455 ",props:{style:{color:"#79C0FF"}}},{content:"packages in ",props:{style:{color:"#A5D6FF"}}},{content:"18.92s",props:{style:{color:"#79C0FF"}}}]},{tokens:[{content:" \xd7 ",props:{style:{color:"#FFA657"}}},{content:"Failed to build `",props:{style:{color:"#A5D6FF"}}},{content:"webrtcvad",props:{style:{color:"#C9D1D9"}}},{content:"=",props:{style:{color:"#FF7B72"}}},{content:"=",props:{style:{color:"#A5D6FF"}}},{content:"2.0.10",props:{style:{color:"#79C0FF"}}},{content:"`",props:{style:{color:"#A5D6FF"}}}]},{tokens:[{content:" \u251c\u2500\u25b6",props:{style:{color:"#FFA657"}}},{content:" The build backend returned an error",props:{style:{color:"#A5D6FF"}}}]},{tokens:[{content:" \u2570\u2500\u25b6",props:{style:{color:"#FFA657"}}},{content:" Call to `setuptools.build_meta:__legacy__.build_wheel` ",props:{style:{color:"#A5D6FF"}}},{content:"failed",props:{style:{color:"#FFA657"}}},{content:" (exit status: ",props:{style:{color:"#A5D6FF"}}},{content:"1",props:{style:{color:"#79C0FF"}}},{content:")",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsx)(n.p,{children:"To resolve this error, install the required build dependencies, and then retry the Langflow installation:"}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"sudo ",props:{style:{color:"#FFA657"}}},{content:"apt-get update",props:{style:{color:"#A5D6FF"}}}]},{tokens:[{content:"sudo ",props:{style:{color:"#FFA657"}}},{content:"apt-get install build-essential python3-dev",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsxs)(n.p,{children:["If upgrading your packages doesn't fix the issue, install ",(0,s.jsx)(n.code,{children:"gcc"})," separately, and then retry the Langflow installation:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"sudo ",props:{style:{color:"#FFA657"}}},{content:"apt-get install gcc",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsxs)(n.h3,{id:"installation-failure-from-webrtcvad-package",children:["Installation failure from ",(0,s.jsx)(n.code,{children:"webrtcvad"})," package"]}),"\n",(0,s.jsxs)(n.p,{children:["If you experience an error from the ",(0,s.jsx)(n.code,{children:"webrtcvad"})," package, run ",(0,s.jsx)(n.code,{children:"uv pip install webrtcvad-wheels"})," in your virtual environment, and then retry the Langflow installation."]}),"\n",(0,s.jsx)(n.h3,{id:"protocol-buffers-protoc-required-for-intel-based-macs",children:"Protocol buffers (protoc) required for Intel-based Macs"}),"\n",(0,s.jsxs)(n.p,{children:["If you're installing Langflow on an Intel-based Mac, you may encounter installation errors if Protocol Buffers Compiler (",(0,s.jsx)(n.code,{children:"protoc"}),") is not installed."]}),"\n",(0,s.jsx)(n.p,{children:"This requirement doesn't apply to Apple Silicon Macs on ARM64."}),"\n",(0,s.jsxs)(n.p,{children:["To resolve this issue, install ",(0,s.jsx)(n.code,{children:"protoc"})," using ",(0,s.jsx)(n.code,{children:"brew install protobuf"}),"."]}),"\n",(0,s.jsxs)(n.p,{children:["For more information, including alternative installation methods, see the ",(0,s.jsx)(n.a,{href:"https://protobuf.dev/installation/",children:"Protocol buffers installation documentation"}),"."]}),"\n",(0,s.jsx)(n.h3,{id:"c-build-tools-required-for-langflow-desktop-on-windows",children:"C++ build tools required for Langflow Desktop on Windows"}),"\n",(0,s.jsxs)(n.p,{children:["Microsoft Windows installations of Langflow Desktop require a C++ compiler that may not be present on your system. If you receive a ",(0,s.jsx)(n.code,{children:"C++ Build Tools Required!"})," error, follow the on-screen prompt to install Microsoft C++ Build Tools, or ",(0,s.jsx)(n.a,{href:"https://visualstudio.microsoft.com/downloads/",children:"install Microsoft Visual Studio"}),"."]}),"\n",(0,s.jsx)(n.h2,{id:"langflow-startup-issues",children:"Langflow startup issues"}),"\n",(0,s.jsx)(n.p,{children:"The following issues can occur when attempting to start Langflow."}),"\n",(0,s.jsxs)(n.h3,{id:"no-langflow__main__-module",children:["No ",(0,s.jsx)(n.code,{children:"langflow.__main__"})," module"]}),"\n",(0,s.jsxs)(n.p,{children:["When you try to run Langflow with the command ",(0,s.jsx)(n.code,{children:"langflow run"}),", you encounter the following error:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:">",props:{style:{color:"#FF7B72"}}},{content:" No module named ",props:{style:{color:"#C9D1D9"}}},{content:"'langflow.__main__'",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsx)(n.p,{children:"To resolve this issue, try the following:"}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsxs)(n.li,{children:["Run ",(0,s.jsx)(n.code,{children:"uv run langflow run"})," instead of ",(0,s.jsx)(n.code,{children:"langflow run"}),"."]}),"\n",(0,s.jsxs)(n.li,{children:["If that doesn't work, reinstall the latest Langflow version with ",(0,s.jsx)(n.code,{children:"uv pip install langflow -U"}),"."]}),"\n",(0,s.jsxs)(n.li,{children:["If that doesn't work, reinstall Langflow and its dependencies with ",(0,s.jsx)(n.code,{children:"uv pip install langflow --pre -U --force-reinstall"}),"."]}),"\n"]}),"\n",(0,s.jsx)(n.h3,{id:"langflow-runtraceback",children:"Langflow runTraceback"}),"\n",(0,s.jsxs)(n.p,{children:["When you try to run Langflow using the command ",(0,s.jsx)(n.code,{children:"langflow run"}),", you encounter the following error:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:">",props:{style:{color:"#FF7B72"}}},{content:" langflow runTraceback (",props:{style:{color:"#C9D1D9"}}},{content:"most ",props:{style:{color:"#FFA657"}}},{content:"recent call last",props:{style:{color:"#A5D6FF"}}},{content:"): File ",props:{style:{color:"#C9D1D9"}}},{content:'".../langflow"',props:{style:{color:"#A5D6FF"}}},{content:", line 5, ",props:{style:{color:"#C9D1D9"}}},{content:"in <",props:{style:{color:"#FF7B72"}}},{content:"module",props:{style:{color:"#C9D1D9"}}},{content:">",props:{style:{color:"#FF7B72"}}},{content:" from langflow.__main__ import mainModuleNotFoundError: No module named ",props:{style:{color:"#C9D1D9"}}},{content:"'langflow.__main__'",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsx)(n.p,{children:"There are two possible reasons for this error:"}),"\n",(0,s.jsxs)(n.ul,{children:["\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.strong,{children:"Multiple Langflow installations"}),": You installed Langflow using ",(0,s.jsx)(n.code,{children:"pip install langflow"})," but you already had a previous version of Langflow installed in your system. In this case, you might be running the wrong executable."]}),"\n",(0,s.jsxs)(n.p,{children:["To solve this issue, run the correct executable by running ",(0,s.jsx)(n.code,{children:"python -m langflow run"})," instead of ",(0,s.jsx)(n.code,{children:"langflow run"}),"."]}),"\n",(0,s.jsxs)(n.p,{children:["If that doesn't work, try uninstalling and reinstalling Langflow with ",(0,s.jsx)(n.code,{children:"uv pip install langflow --pre -U"}),"."]}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.strong,{children:"Version conflict during installation"}),": Some version conflicts might have occurred during the installation process. To resolve this issue, reinstall Langflow and its dependencies by running ",(0,s.jsx)(n.code,{children:"python -m pip install langflow --pre -U --force-reinstall"}),"."]}),"\n"]}),"\n"]}),"\n",(0,s.jsx)(n.h3,{id:"environment-variables-not-available-from-terminal",children:"Environment variables not available from terminal"}),"\n",(0,s.jsxs)(n.p,{children:["Environment variables set in your terminal aren't automatically available to GUI-based applications like Langflow Desktop when launched through the Finder or the Start Menu.\nTo set environment variables for Langflow Desktop, see ",(0,s.jsx)(n.a,{href:"/environment-variables#set-environment-variables-for-langflow-desktop",children:"Set environment variables for Langflow Desktop"}),"."]}),"\n",(0,s.jsx)(n.h3,{id:"access-langflow-desktop-startup-logs",children:"Access Langflow Desktop startup logs"}),"\n",(0,s.jsxs)(n.p,{children:["If you encounter issues with Langflow Desktop, you might need to ",(0,s.jsx)(n.a,{href:"/logging#desktop-logs",children:"access Langflow Desktop startup logs"})," for debugging."]}),"\n",(0,s.jsx)(n.h3,{id:"user-not-found-or-inactive-when-running-multiple-flows",children:"User not found or inactive when running multiple flows"}),"\n",(0,s.jsxs)(n.p,{children:["When running multiple local Langflow OSS instances on different ports, such as ",(0,s.jsx)(n.code,{children:"localhost:7860"})," and ",(0,s.jsx)(n.code,{children:"localhost:7861"}),", you might see authentication errors in the logs.\nFor example:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"[07/22/25 10:57:07] INFO 2025-07-22 10:57:07 - INFO - utils - User not found or inactive.",props:{}}]}],lang:"text"},annotations:[]}]}),"\n",(0,s.jsx)(n.p,{children:"To resolve this error, use separate browser instances or browser profiles to access each Langflow instance."}),"\n",(0,s.jsx)(n.h3,{id:"package-is-not-installed",children:"Package is not installed"}),"\n",(0,s.jsx)(n.p,{children:"In Langflow OSS, you can follow the error message's instructions to install the missing dependency."}),"\n",(0,s.jsxs)(n.p,{children:["To manage dependencies in Langflow Desktop, see ",(0,s.jsx)(n.a,{href:"/install-custom-dependencies#langflow-desktop",children:"Install custom dependencies in Langflow Desktop"}),"."]}),"\n",(0,s.jsx)(n.h2,{id:"langflow-upgrade-issues",children:"Langflow upgrade issues"}),"\n",(0,s.jsx)(n.p,{children:"The following issues can occur when upgrading your Langflow version."}),"\n",(0,s.jsxs)(n.p,{children:["For information about managing Langflow versions, see ",(0,s.jsx)(n.a,{href:"/get-started-installation",children:"Install Langflow"}),"."]}),"\n",(0,s.jsx)(n.h3,{id:"something-went-wrong-running-migrations",children:"Something went wrong running migrations"}),"\n",(0,s.jsxs)(n.p,{children:["The following error can occur during Langflow upgrades when the new version can't override ",(0,s.jsx)(n.code,{children:"langflow-pre.db"})," in the Langflow cache folder:"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:">",props:{style:{color:"#FF7B72"}}},{content:" Something went wrong running migrations. Please, run ",props:{style:{color:"#C9D1D9"}}},{content:"'langflow migration --fix'",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsxs)(n.p,{children:["To resolve this error, clear the cache by deleting the contents of your Langflow cache folder.\nThe filepath depends on your operating system, installation type, and configuration options.\nFor more information and default filepaths, see ",(0,s.jsx)(n.a,{href:"/memory",children:"Memory management options"}),"."]}),"\n",(0,s.jsx)(n.admonition,{type:"danger",children:(0,s.jsx)(n.p,{children:"Clearing the cache erases your settings.\nIf you want to retain your settings files, create a backup of those files before clearing the cache folder."})}),"\n",(0,s.jsx)(n.h3,{id:"langflow-desktop-says-it-is-running-the-latest-version-but-it-is-actually-behind",children:"Langflow Desktop says it is running the latest version, but it is actually behind"}),"\n",(0,s.jsx)(n.p,{children:"If you are running Langflow Desktop version 1.4.2 or earlier, the UI might incorrectly report that you are on the latest version when a newer version is available."}),"\n",(0,s.jsx)(n.p,{children:"This happens because the automatic update feature in the UI was introduced in version 1.4.2.\nEarlier versions can't automatically detect or apply updates."}),"\n",(0,s.jsxs)(n.p,{children:["To resolve this issue, uninstall Langflow Desktop, and then ",(0,s.jsx)(n.a,{href:"https://langflow.org/desktop",children:"download and install the latest version of Langflow Desktop"}),"."]}),"\n",(0,s.jsx)(n.h3,{id:"422-error-when-freezing-components-after-upgrading-pydanticfastapi-dependencies",children:"422 error when freezing components after upgrading Pydantic/FastAPI dependencies"}),"\n",(0,s.jsx)(n.p,{children:"If you locally upgrade your Pydantic and FastAPI dependencies, you may encounter a 422 error when trying to freeze components."}),"\n",(0,s.jsx)(n.p,{children:"This error occurs due to changes in how request bodies are handled in newer versions of these dependencies."}),"\n",(0,s.jsx)(n.p,{children:"If you're experiencing this issue, update your Langflow installation to version 1.6.5 or later, which includes a fix for this issue."}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"uv ",props:{style:{color:"#FFA657"}}},{content:"pip install langflow ",props:{style:{color:"#A5D6FF"}}},{content:"-U",props:{style:{color:"#79C0FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsx)(n.h2,{id:"langflow-uninstall-issues",children:"Langflow uninstall issues"}),"\n",(0,s.jsx)(n.p,{children:"The following issues can occur when uninstalling Langflow."}),"\n",(0,s.jsx)(n.h3,{id:"dot-directory-isnt-deleted-when-uninstalling-langflow-desktop-on-macos",children:"Dot directory isn't deleted when uninstalling Langflow Desktop on macOS"}),"\n",(0,s.jsxs)(n.p,{children:["On macOS, uninstalling Langflow Desktop deletes the ",(0,s.jsx)(n.code,{children:".app"})," file but doesn't delete files in ",(0,s.jsx)(n.code,{children:"~/.langflow"}),", which includes files generated during usage like cache and settings."]}),"\n",(0,s.jsx)(n.p,{children:"If you reinstall Langflow Desktop, it starts with the existing data from the previous installation."}),"\n",(0,s.jsxs)(n.p,{children:["To fully remove a Langflow Desktop macOS installation, you must also delete ",(0,s.jsx)(n.code,{children:"~/.langflow"}),":"]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"rm ",props:{style:{color:"#FFA657"}}},{content:"-rf ",props:{style:{color:"#79C0FF"}}},{content:".langflow",props:{style:{color:"#A5D6FF"}}}]}],lang:"bash"},annotations:[]}]}),"\n",(0,s.jsx)(n.h2,{id:"mcp",children:"Langflow MCP issues"}),"\n",(0,s.jsx)(n.p,{children:"The following issues can occur when using Langflow as an MCP server or client."}),"\n",(0,s.jsx)(n.h3,{id:"claude-for-desktop-doesnt-use-mcp-server-tools-correctly",children:"Claude for Desktop doesn't use MCP server tools correctly"}),"\n",(0,s.jsxs)(n.p,{children:["If Claude for Desktop doesn't use your server's tools correctly, try explicitly defining the path to your local ",(0,s.jsx)(n.code,{children:"uvx"})," or ",(0,s.jsx)(n.code,{children:"npx"})," executable file in the ",(0,s.jsx)(n.code,{children:"claude_desktop_config.json"})," configuration file:"]}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["To find your ",(0,s.jsx)(n.code,{children:"uvx"})," path, run ",(0,s.jsx)(n.code,{children:"which uvx"}),"."]}),"\n",(0,s.jsxs)(n.p,{children:["To find your ",(0,s.jsx)(n.code,{children:"npx"})," path, run ",(0,s.jsx)(n.code,{children:"which npx"}),"."]}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["In your ",(0,s.jsx)(n.code,{children:"claude_desktop_config.json"})," file, add the path to your Langflow MCP server configuration, as shown in the following examples."]}),"\n",(0,s.jsxs)(i.A,{children:[(0,s.jsx)(a.A,{value:"uvx",label:"uvx",default:!0,children:(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"{",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "mcpServers"',props:{style:{color:"#7EE787"}}},{content:": {",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "PROJECT_NAME"',props:{style:{color:"#7EE787"}}},{content:": {",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "command"',props:{style:{color:"#7EE787"}}},{content:": ",props:{style:{color:"#C9D1D9"}}},{content:'"PATH_TO_UVX"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "args"',props:{style:{color:"#7EE787"}}},{content:": [",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "mcp-proxy"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "http://LANGFLOW_SERVER_ADDRESS/api/v1/mcp/project/PROJECT_ID/streamable"',props:{style:{color:"#A5D6FF"}}}]},{tokens:[{content:" ]",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:" }",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:" }",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:"}",props:{style:{color:"#C9D1D9"}}}]}],lang:"json"},annotations:[]}]})}),(0,s.jsx)(a.A,{value:"npx",label:"npx",children:(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"{",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "mcpServers"',props:{style:{color:"#7EE787"}}},{content:": {",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "PROJECT_NAME"',props:{style:{color:"#7EE787"}}},{content:": {",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "command"',props:{style:{color:"#7EE787"}}},{content:": ",props:{style:{color:"#C9D1D9"}}},{content:'"PATH_TO_NPX"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "args"',props:{style:{color:"#7EE787"}}},{content:": [",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "-y"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "supergateway"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "--sse"',props:{style:{color:"#A5D6FF"}}},{content:",",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:' "http://LANGFLOW_SERVER_ADDRESS/api/v1/mcp/project/PROJECT_ID/streamable"',props:{style:{color:"#A5D6FF"}}}]},{tokens:[{content:" ]",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:" }",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:" }",props:{style:{color:"#C9D1D9"}}}]},{tokens:[{content:"}",props:{style:{color:"#C9D1D9"}}}]}],lang:"json"},annotations:[]}]})})]}),"\n"]}),"\n"]}),"\n",(0,s.jsx)(n.h3,{id:"mcp-browser-based-flows-dont-open-a-browser-on-windows",children:"MCP browser-based flows don't open a browser on Windows"}),"\n",(0,s.jsx)(n.p,{children:"This is a known issue when using MCP Tools with browser navigation actions, such as Playwright, on Windows: The agent can execute the tool successfully but the browser tab or window doesn't open."}),"\n",(0,s.jsx)(n.p,{children:"This issue occurs because the MCP server runs from a Python process, which prevents it from opening browser windows in WSL or Windows."}),"\n",(0,s.jsxs)(n.p,{children:["To work around this issue, use the standalone MCP server approach documented in the ",(0,s.jsx)(n.a,{href:"https://github.com/microsoft/playwright-mcp?tab=readme-ov-file#standalone-mcp-server",children:"Playwright MCP repository"}),".\nAfter the server is up and running, you can add it as an HTTP/SSE server in Langflow."]}),"\n",(0,s.jsx)(n.p,{children:"For other browser navigation tools, see the provider's documentation for specific troubleshooting guidance."}),"\n",(0,s.jsx)(n.h3,{id:"no-tools-or-prompts-connected-on-mcp-servers-in-mixed-windowswsl-environments",children:'"No tools or prompts connected" on MCP servers in mixed Windows/WSL environments'}),"\n",(0,s.jsx)(n.p,{children:'If you encounter "No tools or prompts connected" errors or connection failures when using Langflow Desktop as an MCP server with clients running in different environments, such as Langflow on a Windows host and an MCP client in WSL, this is due to network isolation between Windows and WSL environments.'}),"\n",(0,s.jsxs)(n.p,{children:["WSL cannot directly access Windows localhost services, and Langflow running on a Windows host is not accessible from WSL clients at ",(0,s.jsx)(n.code,{children:"localhost:7860"}),"."]}),"\n",(0,s.jsx)(n.p,{children:"To work around this issue, run the server and host in the same operating environment."}),"\n",(0,s.jsxs)(n.p,{children:["Alternatively, configure Langflow Desktop to accept connections from WSL at the default Windows IP address of ",(0,s.jsx)(n.code,{children:"10.255.255.254:7860"})," instead of ",(0,s.jsx)(n.code,{children:"localhost"}),"."]}),"\n",(0,s.jsx)(n.h2,{id:"token-length-limit-errors-in-embedding-model-components",children:"Token length limit errors in Embedding Model components"}),"\n",(0,s.jsxs)(n.p,{children:["Token length errors can happen if your chunking strategy doesn't align with your embedding model's tokenization limits.\nFor more information, see ",(0,s.jsx)(n.a,{href:"/split-text#chunk-size",children:"Tokenization errors due to chunk size"}),"."]}),"\n",(0,s.jsx)(n.h2,{id:"document-processing-errors-in-docker-containers",children:"Document processing errors in Docker containers"}),"\n",(0,s.jsxs)(n.p,{children:["If you're running Langflow in a Docker container, you might encounter errors when using components that handle files or images, such as the ",(0,s.jsxs)(n.a,{href:"/read-file",children:[(0,s.jsx)(n.strong,{children:"Read File"})," component"]})," or ",(0,s.jsxs)(n.a,{href:"/bundles-docling",children:[(0,s.jsx)(n.strong,{children:"Docling"})," components"]}),". To resolve these errors, you might need to install additional system dependencies."]}),"\n",(0,s.jsx)(n.p,{children:"When running Langflow in a Linux-based Docker container, Docling requires system libraries that aren't included in the base Docker image. If you see errors related to document or image processing, add the following to your Dockerfile:"}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"RUN",props:{style:{color:"#FF7B72"}}},{content:" apt-get update && apt-get install -y libgl1 libglib2.0-0",props:{style:{color:"#C9D1D9"}}}]}],lang:"dockerfile"},annotations:[]}]}),"\n",(0,s.jsx)(n.p,{children:"These dependencies are required by Docling for document processing operations."}),"\n",(0,s.jsxs)(n.p,{children:["For more information about customizing Docker images, see ",(0,s.jsx)(n.a,{href:"/deployment-docker#customize-the-langflow-docker-image",children:"Customize the Langflow Docker image with your own code"}),"."]}),"\n",(0,s.jsx)(n.h2,{id:"custom-components-and-integrations-issues",children:"Custom components and integrations issues"}),"\n",(0,s.jsx)(n.p,{children:"For troubleshooting advice for a third-party integration, see the 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structure"}),"."]}),"\n",(0,s.jsx)(p.Code,{codeConfig:g,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"/your/custom/components/path/ # Base directory set by LANGFLOW_COMPONENTS_PATH",props:{}}]},{tokens:[{content:" \u2514\u2500\u2500 category_name/ # Required category subfolder that determines menu name",props:{}}]},{tokens:[{content:" \u251c\u2500\u2500 __init__.py # Required",props:{}}]},{tokens:[{content:" \u2514\u2500\u2500 custom_component.py # Component file",props:{}}]}],lang:"text"},annotations:[]}]}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["Verify each category directory includes an ",(0,s.jsx)(n.code,{children:"__init__.py"})," file.\nThis is required for Python to recognize the directory as a module."]}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["Use the command line argument instead of the environment variable for 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\ No newline at end of file diff --git a/smart-router.html b/smart-router.html index bb47c078e1..03d11969c3 100644 --- a/smart-router.html +++ b/smart-router.html @@ -24,7 +24,7 @@ - + diff --git a/smart-transform.html b/smart-transform.html index c0a0d19acc..759ebb4c4b 100644 --- a/smart-transform.html +++ b/smart-transform.html @@ -24,7 +24,7 @@ - + diff --git a/split-text.html b/split-text.html index bf59db312d..16781c0031 100644 --- a/split-text.html +++ b/split-text.html @@ -24,7 +24,7 @@ - + diff --git a/sql-database.html b/sql-database.html index e2b083b6c5..c1554a57a5 100644 --- a/sql-database.html +++ b/sql-database.html @@ -24,7 +24,7 @@ - + diff --git a/structured-output.html b/structured-output.html index 27430ec354..da03e1bc99 100644 --- a/structured-output.html +++ b/structured-output.html @@ -24,7 +24,7 @@ - + diff --git a/text-input-and-output.html b/text-input-and-output.html index c0ef3e5d23..7b5b318869 100644 --- a/text-input-and-output.html +++ b/text-input-and-output.html @@ -24,7 +24,7 @@ - + diff --git a/troubleshoot.html b/troubleshoot.html index 6790aa69e9..0ead7a8dfe 100644 --- a/troubleshoot.html +++ b/troubleshoot.html @@ -24,7 +24,7 @@ - + @@ -88,6 +88,11 @@

_10
sudo apt-get install gcc

Installation failure from webrtcvad package​

If you experience an error from the webrtcvad package, run uv pip install webrtcvad-wheels in your virtual environment, and then retry the Langflow installation.

+

Protocol buffers (protoc) required for Intel-based Macs​

+

If you're installing Langflow on an Intel-based Mac, you may encounter installation errors if Protocol Buffers Compiler (protoc) is not installed.

+

This requirement doesn't apply to Apple Silicon Macs on ARM64.

+

To resolve this issue, install protoc using brew install protobuf.

+

For more information, including alternative installation methods, see the Protocol buffers installation documentation.

C++ build tools required for Langflow Desktop on Windows​

Microsoft Windows installations of Langflow Desktop require a C++ compiler that may not be present on your system. If you receive a C++ Build Tools Required! error, follow the on-screen prompt to install Microsoft C++ Build Tools, or install Microsoft Visual Studio.

Langflow startup issues​

@@ -215,7 +220,7 @@ If you're using the LANGFLOW_COMPONENTS_PATH environment varia