Update main.py

main.py

@@ -123,7 +123,7 @@ async def start():
         CONDENSE_QUESTION_PROMPT = PromptTemplate.from_template(_template)
         
         ########## Chain with streaming ##########
-        retrieval = wait retriever_to_cache()
+        retrieval = await retriever_to_cache()
         message_history = ChatMessageHistory()
         memory = ConversationBufferMemory(
             memory_key="chat_history",