❗️ Common Installation Issues

This is a list of possible issues that you may encounter when installing Langflow and how to solve them.

No module named 'langflow.__main__'

1. Run python -m langflow run instead of langflow run.
2. If that doesn't work, reinstall Langflow with _python -m pip install langflow --pre -U.
3. If that doesn't work, reinstall Langflow and its dependencies with python -m pip install langflow --pre -U --force-reinstall.

When you try to run Langflow using the command langflow run, you may encounter the following error:

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> langflow run

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Traceback (most recent call last):

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File ".../langflow", line 5, in <module>

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from langflow.__main__ import main

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ModuleNotFoundError: No module named 'langflow.__main__'

There are two possible reasons for this error:

1. You've installed Langflow using 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. To solve this issue, run the correct executable by running python -m langflow run instead of langflow run. If that doesn't work, try uninstalling and reinstalling Langflow with python -m pip install langflow --pre -U.
2. Some version conflicts might have occurred during the installation process. Run python -m pip install langflow --pre -U --force-reinstall to reinstall Langflow and its dependencies.

Something went wrong running migrations. Please, run 'langflow migration --fix'

Clear the cache by deleting the contents of the cache folder.

This folder can be found at:

• Linux or WSL2 on Windows: home/<username>/.cache/langflow/
• MacOS: /Users/<username>/Library/Caches/langflow/

This error can occur during Langflow upgrades when the new version can't override langflow-pre.db in .cache/langflow/. Clearing the cache removes this file but will also erase your settings.

If you wish to retain your files, back them up before clearing the folder.