Security sandbox conflict when I Load atf by worker(flash player of Web browser)

MainSwf:

private function loadWorker():void{
		Security.allowInsecureDomain("*");
	Security.allowDomain("*");
	var workerLoader:URLLoader = new URLLoader();
	workerLoader.dataFormat = URLLoaderDataFormat.BINARY;
	workerLoader.addEventListener(Event.COMPLETE, loadComplete);
	workerLoader.load(new URLRequest("workerSwf.swf"));
}

private function loadComplete(event:Event):void
{
	// create the background worker
	var workerBytes:ByteArray = event.target.data as ByteArray;
	var worker:Worker = WorkerDomain.current.createWorker(workerBytes, true);
	
	// listen for worker state changes to know when the worker is running
	worker.addEventListener(Event.WORKER_STATE, workerStateHandler);
	//build
	mainToWorker = Worker.current.createMessageChannel(worker);
	workerToMain = worker.createMessageChannel(Worker.current);
	
	//init worker name
	worker.setSharedProperty("mainToWorker", mainToWorker);
	worker.setSharedProperty("workerToMain", workerToMain);
	
	workerToMain.addEventListener(Event.CHANNEL_MESSAGE, onWorkerToMain);
	
	worker.start();
}

private function workerStateHandler(e:Event):void{
	_workerInit = true;
	mainToWorker.send(1);
}

workerSwf:

private function init():void{
	Security.allowInsecureDomain("*");
	Security.allowDomain("*");
	//init worker by name
	mainToWorker = Worker.current.getSharedProperty("mainToWorker");
	workerToMain = Worker.current.getSharedProperty("workerToMain");
	//addEventListener
	mainToWorker.addEventListener(Event.CHANNEL_MESSAGE, onMainToWorker);
}

public function onMainToWorker(event:Event):void {
	//load atf
	var loader:URLLoader = new URLLoader();
	loader.dataFormat = URLLoaderDataFormat.BINARY;
	var r:URLRequest = new URLRequest("1.atf");
	
	loader.load(r);/////   throw Error:Security sandbox conflict
	//SecurityError: Error #2148:
			// SWF file file:///D:/A/bin-debug/boot.swf Local resources cannot be accessed file:///D:/A/bin-debug/1.atf。
	//The Local resources can be accessed by the SWF of File system and  trusted Local SWF.
			//at flash.net::URLStream/load()
			//at flash.net::URLLoader/load()
	//
	
	loader.addEventListener(Event.COMPLETE, onComp);
	loader.addEventListener(IOErrorEvent.IO_ERROR, onErr);
	function onComp(e:Event):void{
		var bytes:ByteArray = loader.data as ByteArray;
		bytes.shareable = true;
		workerToMain.send(bytes);
	}
	function onErr(e:IOErrorEvent):void{
		workerToMain.send(0);
	}
}