[Python] `ConversationSummaryBufferMemory` is not fully defined; you should define...

I am attempting to use LangChain's ConversationSummaryBufferMemory and running into this error:

pydantic.errors.PydanticUserError: `ConversationSummaryBufferMemory` is not fully defined; you should define `BaseCache`, then call `ConversationSummaryBufferMemory.model_rebuild()`.


This is what my code looks like:

memory = ConversationSummaryBufferMemory(
llm=llm,
input_key="input",
output_key="output",
max_token_limit=args.get("max_tokens", DEFAULT_MAX_TOKENS),
memory_key="chat_history",
)


I am using langchain==0.3.7.

Has anyone else encountered this?

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