Load swf file, AS3 Class (for windows, IOS and android)

I try this code

package  {          

    import flash.display.SimpleButton;

    import flash.display.MovieClip;

    import flash.events.MouseEvent;

    import flash.display.Loader;

    import flash.events.Event;

    import flash.system.ApplicationDomain;

    import flash.net.URLRequest;

    import flash.system.LoaderContext

          public class load2 extends SimpleButton {

               var loadit:Loader;           

               public function load2() {

                    this.addEventListener(MouseEvent.MOUSE_DOWN, loadfile);

               }

               private function loadfile(event:MouseEvent):void {

                       trace("you clicked me");

                       loadit = new Loader();

                       this.parent.addChild(loadit);

                       var _lc:LoaderContext = new LoaderContext(false, ApplicationDomain.currentDomain, null);

                       loadit.load(new URLRequest("s02.swf"), _lc);

               }

          }

}

but I got compiler error