Unable to use the chat function

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Error chatting
2 validation errors for LLMChain
llm
  instance of Runnable expected (type=type_error.arbitrary_type; expected_arbitrary_type=Runnable)
llm
  instance of Runnable expected (type=type_error.arbitrary_type; expected_arbitrary_type=Runnable)
ERROR:root:2 validation errors for LLMChain
llm
  instance of Runnable expected (type=type_error.arbitrary_type; expected_arbitrary_type=Runnable)
llm
  instance of Runnable expected (type=type_error.arbitrary_type; expected_arbitrary_type=Runnable)
Traceback (most recent call last):
  File "/home/user/Git/langchain-chatbot/handlers/base.py", line 187, in chat
    bot = ConversationalRetrievalChain.from_llm(
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.cache/pypoetry/virtualenvs/langchain-chatbot-mUNeNTez-py3.11/lib/python3.11/site-packages/langchain/chains/conversational_retrieval/base.py", line 372, in from_llm
    doc_chain = load_qa_chain(
                ^^^^^^^^^^^^^^
  File "/home/user/.cache/pypoetry/virtualenvs/langchain-chatbot-mUNeNTez-py3.11/lib/python3.11/site-packages/langchain/chains/question_answering/__init__.py", line 249, in load_qa_chain
    return loader_mapping[chain_type](
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.cache/pypoetry/virtualenvs/langchain-chatbot-mUNeNTez-py3.11/lib/python3.11/site-packages/langchain/chains/question_answering/__init__.py", line 73, in _load_stuff_chain
    llm_chain = LLMChain(
                ^^^^^^^^^
  File "/home/user/.cache/pypoetry/virtualenvs/langchain-chatbot-mUNeNTez-py3.11/lib/python3.11/site-packages/langchain_core/load/serializable.py", line 120, in __init__
    super().__init__(**kwargs)
  File "/home/user/.cache/pypoetry/virtualenvs/langchain-chatbot-mUNeNTez-py3.11/lib/python3.11/site-packages/pydantic/v1/main.py", line 341, in __init__
    raise validation_error
pydantic.v1.error_wrappers.ValidationError: 2 validation errors for LLMChain
llm
  instance of Runnable expected (type=type_error.arbitrary_type; expected_arbitrary_type=Runnable)
llm
  instance of Runnable expected (type=type_error.arbitrary_type; expected_arbitrary_type=Runnable)
INFO: 127.0.0.1:49988 - "POST /chat HTTP/1.1" 500 Internal Server Error