Timer trouble!

programming flash
1

In a game I’m creating, the only last part I have left is to create a timer.
Or a countdown to be precise.
But I get thrown an error when I go to the next frame when the timer is finished.

TypeError: Error #1009: Cannot access a property or method of a null object reference.
	at US_fla::MainTimeline/countDownFunction()
	at flash.utils::Timer/_timerDispatch()
	at flash.utils::Timer/tick()

There must be a way that works so that flash will “gotoAndStop(2);” after 3 minutes?
Please help me :slight_smile:

//Timer
var countDown:Timer = new Timer(10, 179);
var minutes:Number = 02;
var seconds:Number = 59;
var countExecute:Number = 03;
countDown.start();

countDown.addEventListener(TimerEvent.TIMER, countDownFunction);

function countDownFunction(event:TimerEvent):void {
	seconds--;
	
	if (seconds < 00){
		seconds = 59
		minutes--;
		countExecute--;
		trace(countExecute);
	}
	
	if (countExecute == 1) {
		gotoAndStop();
	}
	
	var showTime:String = minutes + ":" + seconds;
	timer_txt.text = showTime;
}