Update app.py

app.py

@@ -89,7 +89,7 @@ def respond(
         agent = LlamaCppAgent(
             provider,
             # system_prompt=f"{system_message}",
-            predefined_messages_formatter_type=MessagesFormatterType.GEMMA2,
+            predefined_messages_formatter_type=MessagesFormatterType.GEMMA_2,
             debug_output=True,
         )