Undefined property Timer ??

[Leftyplayer]

This is the code (simple):

var timer:Timer = new Timer(2000, 1);
timer.addEventListener(TimerEvent.Timer, onTimer);
timer.start();

function onTimer(evt:TimerEvent):void {
r1.filters = sampleFilters; }


This is the error:

"access of possibly undefined property Timer through a reference with statis type"

And I do did import flash.events.TimerEvent; --- am I supposed to import something else? Is this the problem?

TIA