Update app.py

app.py

@@ -1,7 +1,8 @@
 from llama_index.core import SimpleDirectoryReader, GPTListIndex, GPTVectorStoreIndex, PromptHelper
 from llama_index.core import StorageContext, load_index_from_storage
 #from llama_index import LLMPredictor, PromptHelper
-from langchain.chat_models import ChatOpenAI
+#from langchain.chat_models import ChatOpenAI
+from langchain.community.chat_models import ChatOpenAI
 import gradio as gr
 import os
 import openai