Update app.py

app.py

@@ -32,6 +32,7 @@ from langchain.agents.format_scratchpad import format_to_openai_functions
 from langchain.prompts import MessagesPlaceholder
 from langchain.memory import ConversationBufferMemory
 from langchain.memory import ConversationBufferWindowMemory
+from langchain_core.utils.function_calling import convert_to_openai_function
 
 
 # Import necessary modules for creating additional tools