Unable to serialize ChatHistory

[j-ajim]

thread = ChatHistoryAgentThread(chat_history, session_id)
while True:
    user_input = input(f"User >")
    if user_input.lower() == "exit":
        break

    # Add user input to the agent and get a response
    async for response in planning_agent.invoke(messages=user_input, thread=thread):
        thread = response.thread
        print(f"\n {response}\n")

history = thread._chat_history
history.store_chat_history_to_file(history_file)

=====================================================

My agent is making a function call also. While saving the chat, getting the following error:
**Please note that the error does not occur when function call is not made.

File "site-packages/semantic_kernel/contents/chat_history.py", line 377, in store_chat_history_to_file
json_str = self.serialize()
File ".local/lib/python3.10/site-packages/semantic_kernel/contents/chat_history.py", line 347, in serialize
raise ContentSerializationError(f"Unable to serialize ChatHistory to JSON: {e}") from e
semantic_kernel.exceptions.content_exceptions.ContentSerializationError: Unable to serialize ChatHistory to JSON: Unable to serialize unknown type: <class 'semantic_kernel.services.ai_service_selector.AIServiceSelector'>

[moonbox3]

Hi @j-ajim, what version of SK are you running?

I am unable to repro this error after adding

history = thread._chat_history
history.store_chat_history_to_file("chat_history.json")

To this sample: https://github.com/microsoft/semantic-kernel/blob/main/python/samples/getting_started_with_agents/chat_completion/step4_chat_completion_agent_plugin_simple.py

The chat history is serialized properly and stored to a file without error.

Looks like you have some custom code in a plugin that is related to an AIServiceSelector? As we don't provide a way to pass in custom exclude attributes to the model_dump_json call that serialize uses, I'd suggest you look into performing the model_dump_json(exclude={"key-to-exclude"}) yourself, to see if that works.

[j-ajim]

Thanks..this happened because I was reading kernel parameter in my plugin.