[Python] In Langchain, why ConversationalRetrievalChain not remembering the chat history and...

I am trying to create an customer support system using langchain. I am using text documents as external knowledge provider via TextLoader

In order to remember the chat I using ConversationalRetrievalChain with list of chats

My problem is, each time when I execute conv_chain({"question": prompt, "chat_history": chat_history}),

it is creating a new ConversationalRetrievalChain that is, in the log, I get Entering new ConversationalRetrievalChain chain > message

And the chat_history array looks like, multiple nested arrays :

[[ "Hi I am Ragesh", "Hi Ragesh, How are your"] , ["What is my name?", "Sorry, As an AI....., " ]]


So it couldn't remember my previous chat.

Why this is happening ?

I am very new to AI field. Please help me.

My code:

https://gist.github.com/RageshAntony/79a9050b76e74f5ea868888cd57c6705

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