python

LangChain Chain Missing Input Variables

langchain.*ChainError.*missing.*input_variables

Fixes

1.Check all required variables in prompt template are passed
2.Verify chain.invoke() dict keys match template variables
3.Use chain.input_schema to see required inputs

langchainchaininput

Related Errors

Asyncio event loop already running

RuntimeError: This event loop is already running

•Use nest_asyncio.apply() to allow nested event loops
•Use asyncio.run_coroutine_threadsafe() instead of asyncio.run()

Coroutine never awaited

RuntimeWarning: coroutine '.*' was never awaited

•Add 'await' before the coroutine call
•Use asyncio.create_task() to schedule the coroutine

Asyncio task was cancelled

asyncio\.CancelledError

•Handle CancelledError in try/except within the task
•Use asyncio.shield() to protect critical sections from cancellation