Update app.py

app.py

@@ -20,8 +20,8 @@ from langchain_community.vectorstores import FAISS
 from langchain_groq import ChatGroq
 from langchain_core.prompts import ChatPromptTemplate,MessagesPlaceholder
 
-from langchain.chains.combine_documents import create_stuff_documents_chain
-from langchain.chains import create_retrieval_chain
+from langchain_classic.chains.combine_documents import create_stuff_documents_chain
+from langchain_classic.chains import create_retrieval_chain
 
 from langchain_core.runnables.history import RunnableWithMessageHistory
 from langchain_community.chat_message_histories import ChatMessageHistory