Feathersui themes problem

Hi there,

I'm trying to set up a hello-world app using feathersui framework and starling. I've got starling to work perfectly just by following their example on the website and instead of passing the class name "Game" to Starling object, I've passed the name of the class that is used for feathers  UI.  All  featherui and starling SWC's are in the project settings.

I'm getting this error about importing the package themes

Unfortunately, every example included in the source file uses one of the provided themes and I couldn't get any to work!

Please help.

package
{
    import starling.display.Sprite;
    import feathers.themes.MetalWorksMobileTheme;    /// here is the problem!!  any idea?
    import feathers.controls.Button;
    import feathers.controls.Label;
    import feathers.controls.Callout;
    import starling.events.Event;
    class feathers extends Sprite
    {
        public function feathers()
        {
            this.addEventListener( Event.ADDED_TO_STAGE, addedToStageHandler );
        }
        protected var theme:MetalWorksMobileTheme
        protected var button:Button;
        protected function addedToStageHandler( event:Event ):void
        {
            this.theme = new MetalWorksMobileTheme(this.stage);
            this.button = new Button();
            this.button.label = "Click Me";
            this.addChild(button);
            this.button.addEventListener(Event.TRIGGERED, bt);
            this.button.validate();
            this.button.x = (this.stage.stageWidth - this.button.width) / 2;
            this.button.y = (this.stage.stageHeight - this.button.height) / 2;
        }
        private function bt(e:Event):void
        {
            const label:Label = new Label();
            label.text = "Hi, I'm Feathers!\nHave a nice day.";
            Callout.show(label, this.button);
        }
    }    
}