I have just joined that list and want to know why the following error is occuring when i used to subscribe with SER with an OPAL 2.0 client.

0(2876) handle_subscription() entered
0(2876) check_message(): Accepts application/simple-message-summary not valid for event package et=message-summary
0(2876) handle_subscription(): Error while checking message
0(2876) handle_subscription about to send_reply and return -2