Why is google ads telling me: "Encountered flash error - ad cannot use mouse tracking."

Mouse Tracking issue

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="336" minHeight="280" width="336" height="280" includeInLayout="true" click="handleClick(event)">

	<fx:Script>
		<![CDATA[
		
			public function handleClick(mouseEvent:MouseEvent):void {
				navigateToURL(new URLRequest(root.loaderInfo.parameters.clickTAG),"_blank");	
			}	

		]]>
	</fx:Script>

</s:Application>