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it seems your event queue size is full. change your event queue size from controller settings in CBM by right clicking on the controller hardware . sometimes controller reset also helps.
check for online help, it gives you detail.
I see. I found these codes described in Control Builder help (F1): Error and Status messages: General status codes.
It says -11 cErrQueueOverflow An attempt was made to put an element in a full queue.
But the problem turned out to be that there were no event subscribers. i added the controller to the AE OPC server and that solved the problem.