Error with SwfLoader and new application domain

ok I can't do it, so I copy it here

    public class TestSWFLoader {
        protected var swfloader:SWFLoader;
        
        [Before(async,ui)]
        public function setUp():void {
            swfloader = new SWFLoader();
            Async.proceedOnEvent( this, swfloader, FlexEvent.CREATION_COMPLETE, 100 );
            UIImpersonator.addChild( swfloader );
        }
        
        [After(async,ui)]
        public function tearDown():void {
            swfloader.unloadAndStop();
            UIImpersonator.removeChild( swfloader );            
            swfloader = null;

        }

        [Test(async,ui)]
        public function testLoad() : void {

            swfloader.addEventListener(Event.COMPLETE, Async.asyncHandler( this, onLoadComplete, 500 ), false, 0, true );
             var loaderctx :    LoaderContext = new LoaderContext();
            loaderctx.applicationDomain = new ApplicationDomain();
            //loaderctx.applicationDomain = ApplicationDomain.currentDomain;
            swfloader.loaderContext = loaderctx;
            swfloader.load('resources/Example.swf');
        }
        
        protected function onLoadComplete( event:Event, passThroughData:Object )
        {
            Assert.assertEquals(swfloader.source, 'resources/Example.swf');
        }
    }