Update app.py

app.py

@@ -169,7 +169,7 @@ def create_conversational_rag_chain(retriever):
         max_tokens=200,
         repeat_penalty=1.7,
         last_n_tokens_size = 200,
-        # callback_manager=callback_manager,
+        callback_manager=callback_manager,
         verbose=False,
     )