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<title data-rh="true">❗️ Common Installation Issues | Langflow Documentation</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://langflow-ai.github.io/getting-started-common-installation-issues"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="❗️ Common Installation Issues | Langflow Documentation"><meta data-rh="true" name="description" content="This is a list of possible issues that you may encounter when installing Langflow and how to solve them."><meta data-rh="true" property="og:description" content="This is a list of possible issues that you may encounter when installing Langflow and how to solve them."><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://langflow-ai.github.io/getting-started-common-installation-issues"><link data-rh="true" rel="alternate" href="https://langflow-ai.github.io/getting-started-common-installation-issues" hreflang="en"><link data-rh="true" rel="alternate" href="https://langflow-ai.github.io/getting-started-common-installation-issues" hreflang="x-default"><link rel="preconnect" href="https://www.google-analytics.com">
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.68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Getting Started</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">❗️ Common Installation Issues</span><meta itemprop="position" content="2"></li></ul></nav><div class="theme-doc-markdown markdown"><header><h1>❗️ Common Installation Issues</h1></header><style>[data-ch-theme="github-dark"] { --ch-t-colorScheme: dark;--ch-t-foreground: #c9d1d9;--ch-t-background: #0d1117;--ch-t-lighter-inlineBackground: #0d1117e6;--ch-t-editor-background: #0d1117;--ch-t-editor-foreground: #c9d1d9;--ch-t-editor-lineHighlightBackground: #6e76811a;--ch-t-editor-rangeHighlightBackground: 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<p>This is a list of possible issues that you may encounter when installing Langflow and how to solve them.</p>
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<hr>
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<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>> No module named 'langflow.__main__'</span></div></div><br></code></div></div>
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<ol>
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<li>Run <code>python -m langflow run</code> instead of <code>langflow run</code>.</li>
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<li>If that doesn't work, reinstall Langflow with <code>_python -m pip install langflow --pre -U</code>.</li>
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<li>If that doesn't work, reinstall Langflow and its dependencies with <code>python -m pip install langflow --pre -U --force-reinstall</code>.</li>
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</ol>
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<p>When you try to run Langflow using the command <code>langflow run</code>, you may encounter the following error:</p>
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<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>> langflow runTraceback (most recent call last): File ".../langflow", line 5, in <module> from langflow.__main__ import mainModuleNotFoundError: No module named 'langflow.__main__'</span></div></div><br></code></div></div>
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<p>There are two possible reasons for this error:</p>
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<ol>
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||
<li>You've installed Langflow using <code>pip install langflow</code> but you already had a previous version of Langflow installed in your system. In this case, you might be running the wrong executable. To solve this issue, run the correct executable by running <code>python -m langflow run</code> instead of <code>langflow run</code>. If that doesn't work, try uninstalling and reinstalling Langflow with <code>python -m pip install langflow --pre -U</code>.</li>
|
||
<li>Some version conflicts might have occurred during the installation process. Run <code>python -m pip install langflow --pre -U --force-reinstall</code> to reinstall Langflow and its dependencies.</li>
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</ol>
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<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>> Something went wrong running migrations. Please, run 'langflow migration --fix'</span></div></div><br></code></div></div>
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||
<p>Clear the cache by deleting the contents of the cache folder.</p>
|
||
<p>This folder can be found at:</p>
|
||
<ul>
|
||
<li><strong>Linux or WSL2 on Windows</strong>: <code>home/<username>/.cache/langflow/</code></li>
|
||
<li><strong>MacOS</strong>: <code>/Users/<username>/Library/Caches/langflow/</code></li>
|
||
</ul>
|
||
<p>This error can occur during Langflow upgrades when the new version can't override <code>langflow-pre.db</code> in <code>.cache/langflow/</code>. Clearing the cache removes this file but will also erase your settings.</p>
|
||
<p>If you wish to retain your files, back them up before clearing the folder.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/getting-started-quickstart"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">⚡️ Quickstart</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/starter-projects-basic-prompting"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Basic Prompting</div></a></nav></div></div></div></div></main></div></div></div><div id="ms-floating-button" class="ms-fixed ms-bottom-4 ms-right-8 ms-z-[100] ms-flex ms-flex-col ms-items-end hover:ms-cursor-pointer"><div class="ms-relative ms-mb-4"><div style="background-color:#f6f6f6" class="ms-absolute -ms-bottom-1 ms-right-6 -ms-z-10 ms-h-4 ms-w-4 ms-rotate-45"></div><div style="background-color:#f6f6f6" class="ms-z-10 ms-flex ms-items-center ms-justify-center ms-rounded-lg ms-px-3 ms-py-2"><p style="color:#000000;margin:0" class="ms-text-sm">Hi, how can I help you?</p></div></div><div style="background-color:#f6f6f6" class="ms-flex ms-h-16 ms-w-16 ms-flex-col ms-items-center ms-justify-center ms-self-end ms-rounded-full ms-p-2 ms-transition"><div class="ms-rotate-0 ms-flex ms-h-full ms-w-full ms-transform ms-cursor-pointer ms-items-center ms-justify-center ms-rounded-full ms-transition-all ms-delay-75 ms-duration-100 ms-ease-in-out"><div style="color:#000000;font-size:22px;width:48px;height:48px;margin:0px;padding:0px;display:flex;align-items:center;justify-content:center;text-align:center"><img src="/img/chain.png" style="width:40px"></div></div></div><div></div></div></div>
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