Upload app.py

app.py

@@ -144,8 +144,9 @@ def setup_ai():
 
     # Create a chat engine from the index
     chat_engine = index.as_chat_engine(
+        chat_mode="context",
         system_prompt=system_prompt,
-        context_str=context_str
+        context_template=context_str
     )
 
 def response(message, history):