Countdown problem

hello everyone. i'm making flash game , need little countdown.

 

 

here's code

 

var contagem:number = 30;

 

 

var meutempo:timer = new timer(1000,contagem);

 

meutempo.addeventlistener(timerevent.timer, countdown);

 

meutempo.start();

 

 

function countdown(event:timerevent):void {

tmp.text = "tempo:" + string((contagem)- meutempo.currentcount);

 

 

if((contagem)-meutempo.currentcount==0)

{

   gotoandplay(12)

   }

}

 

 

 

i want code in multiple frames. everytime test movie error appears:

 

 

error #1009: cannot access property or method of null object reference.

          @ teste_fla::maintimeline/countdown()[teste_fla.maintimeline::frame1:83]

          @ flash.utils::timer/flash.utils:timer::_timerdispatch()

          @ flash.utils::timer/flash.utils:timer::tick()

 

 

i think error here

tmp.text = "tempo:" + string((contagem)- meutempo.currentcount);    (frame1:83)

 

 

can me?

 

 

thanks in advance.

tmp not exist when code executes , error appears.

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