Running into this issue on llama-index-

AttributeError                            Traceback (most recent call last)
Cell In[24], line 3
      1 global chat_engine
----> 3 response = chat_engine.chat("What do you know about Darthus?")

File ~\miniconda3\lib\site-packages\llama_index\core\callbacks\utils.py:41, in trace_method.<locals>.decorator.<locals>.wrapper(self, *args, **kwargs)
     39 callback_manager = cast(CallbackManager, callback_manager)
     40 with callback_manager.as_trace(trace_id):
---> 41     return func(self, *args, **kwargs)

File ~\miniconda3\lib\site-packages\llama_index\core\chat_engine\context.py:160, in ContextChatEngine.chat(self, message, chat_history)
    158 if chat_history is not None:
    159     self._memory.set(chat_history)
--> 160 self._memory.put(ChatMessage(content=message, role="user"))
    162 context_str_template, nodes = self._generate_context(message)
    163 prefix_messages = self._get_prefix_messages_with_context(context_str_template)

File ~\miniconda3\lib\site-packages\llama_index\core\memory\chat_memory_buffer.py:140, in ChatMemoryBuffer.put(self, message)
    138 def put(self, message: ChatMessage) -> None:
    139     """Put chat history."""
--> 140     self.chat_store.add_message(self.chat_store_key, message)

File ~\miniconda3\lib\site-packages\llama_index\core\storage\chat_store\simple_chat_store.py:34, in SimpleChatStore.add_message(self, key, message, idx)
     32 """Add a message for a key."""
     33 if idx is None:
---> 34     self.store.setdefault(key, []).append(message)
     35 else:
     36     self.store.setdefault(key, []).insert(idx, message)

AttributeError: 'ContextChatEngine' object has no attribute 'append'