So I've been playing around with the portal.

The biggest issue I have been having was when there was no custom portal icon. There would be a URL error thrown. After many google searches, I always ended up with error catching that worked with URLLoader imports. They didn't work for me.

As it turns out Loader imports (like picture and such) have a different way of posting errors:

var loader:Loader = new Loader();
configureListeners(loader.contentLoaderInfo);

private function configureListeners(dispatcher:IEventDispatcher):void {
dispatcher.addEventListener(Event.COMPLETE, completeHandler);
dispatcher.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler);
dispatcher.addEventListener(Event.INIT, initHandler);
dispatcher.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler); // the one i needed
dispatcher.addEventListener(Event.OPEN, openHandler);
dispatcher.addEventListener(ProgressEvent.PROGRESS, progressHandler);
dispatcher.addEventListener(Event.UNLOAD, unLoadHandler);
}

And with this i fixed all bugs.

Thanks to every one that helped.