Simple workers/concurrency demo

Hi,

I would kindly ask if someone could give me a few pointers when it comes to using workers within the flash IDE (Mac, FP 14).

I have created a completely blank SWF called 'Worker.swf'.

I have also created another SWF called 'Main.swf'. The 'Main.swf' file only contains the following code (as pulled from Adobe documentation)...

import flash.system.Worker;



var bgWorker:Worker;


var workerLoader:URLLoader = new URLLoader(); 
workerLoader.dataFormat = URLLoaderDataFormat.BINARY; 
workerLoader.addEventListener(Event.COMPLETE, loadComplete); 
workerLoader.load(new URLRequest("Worker.swf")); 



function loadComplete(event:Event):void { 

     var workerBytes:ByteArray = event.target.data as ByteArray; 
     bgWorker = WorkerDomain.current.createWorker(workerBytes); 


     bgWorker.addEventListener(Event.WORKER_STATE, workerStateHandler); 
     bgWorker.start(); 

     function workerStateHandler(event:Event):void { 
          if (bgWorker.state == WorkerState.RUNNING) { 
               trace("The worker is running.");
          } 
    } 

}

I know this contains none of the callers etc, and if this is run in Debug, is compiles fine and the trace is successfully made.

HOWEVER

When I test this within the IDE (Test Movie), I get the following error:

This error will be produced every time, unless the following lines are removed;

Code:

bgWorker.addEventListener(Event.WORKER_STATE, workerStateHandler); 
bgWorker.start(); 

So, to me this appears to perhaps be an issue with the IDE itself, as opposed to the code? I would really be super appreciative if someone could provide their assistance.

My thanks in advance!!