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Why does this code raise a TypeError?

medium📝 Debug Q7 of 15
LangChain - RAG Chain Construction
Why does this code raise a TypeError? 
retriever = MultiQueryRetriever(queries=["AI", "ML"])
results = retriever.get_relevant_documents("Explain AI")
AMissing required retriever argument during initialization.
Bget_relevant_documents does not accept arguments.
CQueries list contains invalid types.
DMultiQueryRetriever cannot call get_relevant_documents.
Step-by-Step Solution
Solution:

  1. Step 1: Check constructor parameters

    MultiQueryRetriever requires a retriever argument to function properly.

  2. Step 2: Confirm error cause

    Omitting retriever causes a TypeError because the class expects it.

  3. Final Answer:

    Missing required retriever argument during initialization. -> Option A

  4. Quick Check:

    Retriever argument required = C [OK]
Quick Trick: Always provide retriever when creating MultiQueryRetriever [OK]
Common Mistakes:
  • Forgetting retriever argument
  • Passing wrong types in queries
  • Misusing get_relevant_documents method

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