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mgr The QAManagerBase that processed the message.
exception The exception that occurred.
message If the exception occurred after the message was passed to onMessage(QAMessage), the message that was processed. Otherwise, null.
This method is called whenever an exception occurs while listening for messages.
Note that this method cannot be used to automatically close the QAManagerBase instance, as the QAManagerBase.close() method blocks until all message listeners are finished processing.