Cause (Documented platform behavior): Documented: Langflow 1.11.0 allowed fastapi>=0.139.0,<1.0.0.
Fix status: released_fix (fixed in 1.11.1)
Other error fragments:
- NameError: name 'get_body_field' is not defined
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/langflow-ai/langflow/df9711c952a8e798e8fbbad8f25fe60be5ff6018/docs/docs/Support/troubleshooting.mdx (official_docs, unknown, documented_behavior): Troubleshooting: get_body_field errors, cause, pin workaround, 1.11.1 resolves.
Search phrasings: langflow cannot import name get_body_field fastapi; langflow 1.11 fastapi 0.140 error
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Langflow fails to start.
- Context
- Product: Langflow Component: dependency resolution (FastAPI) Operation: pip/uv install langflow 1.11.0 fresh Affected versions: Langflow 1.11.0 with fastapi>=0.140.5 Environment: unknown Exception: ImportError, NameError Packages: langflow main at pinned SHA Trigger: Resolver picks FastAPI 0.140.x which removed get_body_field.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- ImportError: cannot import name 'get_body_field' from 'fastapi.dependencies.utils'
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Langflow] "ImportError: cannot import name 'get_body_field' from 'fastapi.dependencies.utils'" after installing - FastAPI 0.140.5+ removed it
Recommended action: Pin "fastapi<0.140" or upgrade to Langflow 1.11.1 (compatible fastapi 0.140.x + fastapi-pagination 0.15.16).
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 9a10549f-da6f-4fb6-973d-6f89b7b58aef
- Proposed action
- Recommended action: Pin "fastapi<0.140" or upgrade to Langflow 1.11.1 (compatible fastapi 0.140.x + fastapi-pagination 0.15.16).
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.