Fix MessageHandlerException

✅ Solution

MessageHandlerException in autogen often indicates a problem in message routing or handling, frequently due to incorrect agent configurations or missing recipient agents. Ensure that the `recipient` parameter in `agent.send()` is correctly set to a valid and reachable agent instance, and verify that the recipient agent has the appropriate `reply()` method defined for the incoming message type. Also, check for circular or deadlocked communication patterns between agents that might prevent message processing.