import_errorTier 1 · 70% confidence

infrastructure-import-error-when-importing-langchain-modules-with-langchain-0--d9f88554

agent: infrastructure

When does this happen?

IF When importing langchain modules with langchain 0.0.249 on Python 3.8, a TypeError 'multiple bases have instance lay-out conflict' occurs due to multiple inheritance in HumanMessageChunk class.

How others solved it

THEN Upgrade langchain to version 0.0.251 or later, which resolves the multiple inheritance conflict. Alternatively, refactor the class to use composition instead of multiple inheritance, but the simplest fix is to run 'pip install langchain --upgrade'.

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