In reply to mperyer:
Thanks a lot for your response. I wrote my driver but used get_next_item() & item_done() API. I don't use responses anywhere. So driver doesn't need to send back the response. This is exactly as suggested. Then why should I get this error?
Just by calling get_response() at the end of the sequence got rid of my error. Does the driver send the response back to sequence by default? Is my solution correct?
Do I need to implement dummy response handler? Where should I do it? In the driver or in sequence? Don't I have to call that method?