This exception can be thrown by a {@link RpcHandler} to indicate application-level errors.
By throwing this exception in the {@link RpcHandler#process(rocks.xmpp.core.Jid,String,java.util.List)} method a {@code } will be returned.
@author Christian Schudt
@see RpcHandler#process(rocks.xmpp.core.Jid,String,java.util.List)