dependency_version_compatibilityTier 1 · 70% confidence

infrastructure-dependency-version-c-importing-langchain-modules-fails-with-pydanticuse-86298dbd

agent: infrastructure

When does this happen?

IF Importing Langchain modules fails with PydanticUserError: 'If you use @root_validator with pre=False you MUST specify skip_on_failure=True'.

How others solved it

THEN Resolve pydantic version mismatch: for Langchain versions before ~0.0.267, downgrade pydantic to 1.10.9 using `pip install pydantic==1.10.9`. For newer Langchain (≥0.0.267), upgrade Langchain to a version that supports pydantic 2. Alternatively, upgrade Python to 3.9+ and install a compatible Langchain release like 0.0.219.

# Downgrade pydantic for older Langchain
pip install pydantic==1.10.9
# Or upgrade Langchain to latest
pip install --upgrade langchain

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