Public Sub SetExceptionListener(
     ByVal address As String,
    ByVal listener As ExceptionListener
)

public void SetExceptionListener(
     string address,
    ExceptionListener listener
)

ExceptionListener delegate accepts QAException and QAMessage parameters. You may set an ExceptionListener and a MessageListener for a given address, but you must be consistent with the Listener/Listener2 delegates. That is, you cannot set an ExceptionListener and a MessageListener2, nor an ExceptionListener2 and a MessageListener, for the same address.

For more information, see Receiving messages asynchronously.