Update app.py

app.py

@@ -162,7 +162,7 @@ def conversation(qa_chain, message, history):
 def demo():
     with gr.Blocks(theme='base') as demo:
         #vector_db = gr.State()
-        #qa_chain = gr.State()
+        qa_chain = gr.State()
         #collection_name = gr.State()   
         
         vector_db, collection_name = initialize_database(list_file_obj)