Update app.py

app.py

@@ -5,7 +5,7 @@ from dotenv import load_dotenv
 from langchain_openai import ChatOpenAI, OpenAIEmbeddings
 from langchain_astradb import AstraDBVectorStore
 
-from langchain.agents.agent import AgentExecutor
+from langchain.agents.agent_executor import AgentExecutor
 from langchain.agents.openai_functions_agent import (
     create_openai_functions_agent,
 )