Ciao senti a me quel codice da errore prova questo:
Codice:
var paramList:Object = this.root.loaderInfo.parameters;
// Listen for the CLICK event on the button clip.
buttonClip.addEventListener(MouseEvent.CLICK, openURL);
// When the button is clicked then the navigateToURL function will open the
// specified URL. The function does not accept the URL directly as a String.
// You need to specify the URL as a URLRequest object.
function openURL(evtObj:MouseEvent):void {
var request:URLRequest = new URLRequest(paramList["clickTag"]);
navigateToURL(request, "_blank");
}