[Action Script] Error in Timer May,2012

Hi,
I have a problem with the following code:
ActionScript Code: var myTimer:Timer = new Timer(100);myTimer.addEventListener(TimerEvent.TIMER, correr);myTimer.start();function correr(event:TimerEvent):void{stope.addEventListener(MouseEvent.CLICK, parar);}function parar(Event:MouseEvent):void{myTimer.stop()rea1.text = (getTimer() + " ms");}It's suposed to start a timer that stops when I press the 'stope' button and display that time (after stoped) in the text box 'rea1'. But that doesn't happen and the following text keeps repeating many times when I enter the frame:
Code: TypeError: Error #1009: Cannot access a property or method of a null object reference.
        at MyGame_fla::MainTimeline/correr()
        at flash.utils::Timer/_timerDispatch()
        at flash.utils::Timer/tick()Could someone help me please?
Thanks
Error in Timer

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