Help! How to create a count up in Animate?

[NicoBeaulieu]

I'm creating an animated info graphic about tigers and need a count up from 0 to 3200 to show the current population of tigers in Asia.

This is my current Code:

var countUpInc:int = 1;
var totalSecs:int = 30000;
var countUp = 0;
var countTimer:Timer = new Timer(countUpInc);
countTimer.addEventListener(TimerEvent.TIMER, timerHandler);
countTimer.start();
function timerHandler(e:TimerEvent): void {
  if (countUp == 3200) {
  countTimer.stop();
  countUp = totalSecs;
  } else {
  countUp = countUp + countUpInc;
  counter.countertext.text = countUp;
  trace(countUp);
  }
}

the code runs and displays 300 then crashes as shown by the trace.

I get the error:

" TypeError: Error #1009: Cannot access a property or method of a null object reference.

at TigerInfographic_fla::MainTimeline/timerHandler()[TigerInfographic_fla.MainTimeline::frame210:17]

at flash.utils::Timer/_timerDispatch()

at flash.utils::Timer/tick() "

i don't know how to fix it.

.fla file: NBeaulieu_FinalAnimation.zip - Google Drive

[kglad · Accepted solution]

you need a movieclip named counter that has a textfield (countertext).