Update app.py

app.py

@@ -36,7 +36,8 @@ def respond(
     repeat_penalty,
     selected_topic
 ):
-    chat_template = MessagesFormatterType.DEFAULT  # Changed to default mode
+    # Use a valid message formatter type
+    chat_template = MessagesFormatterType.SIMPLE  # Change to a valid type if DEFAULT is not available
 
     print("HISTORY SO FAR ", history)
     print("Selected topic:", selected_topic)