Update app.py

app.py

@@ -9,6 +9,7 @@ from langgraph.prebuilt import create_react_agent
 from langgraph.graph.message import add_messages
 from langgraph_supervisor import create_supervisor
 #from langchain_huggingface import HuggingFaceEndpoint, ChatHuggingFace
+from langchain_google_genai import ChatGoogleGenerativeAI
 from langchain_core.tools import tool
 from langchain_core.messages import HumanMessage, SystemMessage, BaseMessage
 from langchain.chat_models import init_chat_model