as this method is called.&nbsp; Once the monitoring has been started with a specific event, providing a new monitor event results in an error.&nbsp; To change trigger events, you must first <a href="#uvm_heartbeat.stop" class=LMethod id=link9 onMouseOver="ShowTip(event, 'tt7', 'link9')" onMouseOut="HideTip('tt7')">stop</a> the monitor and then <a href="#uvm_heartbeat.start" class=LMethod id=link10 onMouseOver="ShowTip(event, 'tt6', 'link10')" onMouseOut="HideTip('tt6')">start</a> with a new event trigger.</