conversation_summary = ConversationChain( llm=llm, memory=ConversationBufferWindowMemory(k=10, return_messages=True), prompt=prompt_template, verbose=True ) update this line, it resolved my issue.

Pradip Nichite ValueError: variable history should be a list of base messages. Can you please help with it?

I got same error, working on it, if i find a solution share with you :)