AS3 : Type was not found or was not a compile-time constant: Timer

[Krusty]

package 
{
 
 import flash.events.TimerEvent;
 import flash.events.Event;
 import flash.utils.Timer;
 
	public class  
	{
 
            var timer:Timer = new Timer(1000);
            timer.addEventListener(TimerEvent.TIMER, function():void{} );
            timer.start();
 
	}
 
}

Выдает ошибку, но не импорта. С чего бы?
Type was not found or was not a compile-time constant: Timer
Error: Call to a possibly undefined method Timer