fixed the message format issue

app.py

@@ -828,17 +828,18 @@ def create_application():
             # Call the agent and get the response
             response = await stream_agent_response(question, chat_history[:-2])
             
-            if isinstance(response, list):
-                for msg in response:
-                    if msg["role"] == "assistant":
-                        # Update the assistant's response
-                        chat_history[-1] = msg
+            # Convert the response to the correct format for the chat history
+            if isinstance(response, list) and response:
+                # The response is already in the format [(None, assistant_message)]
+                # Extract the assistant message and update the chat history
+                assistant_message = response[0][1] if isinstance(response[0], (list, tuple)) and len(response[0]) > 1 else str(response[0])
+                chat_history[-1]["content"] = assistant_message
             
             logger.info("Response generation complete")
             return chat_history
             
         except Exception as e:
-            error_msg = f"Error al procesar la solicitud: {str(e)}"
+            error_msg = f"## ❌ Error\n\nError al procesar la solicitud:\n\n```\n{str(e)}\n```"
             logger.error(error_msg, exc_info=True)
             chat_history[-1]["content"] = error_msg
             return chat_history