unknown null object/method error

[sodiumbadams]

Hi
I'm having a problem with this code for selecting a character for a game. The scrolling left and right codes work but when it comes to accepting the highlighted character, I get this;

TypeError: Error #1009: Cannot access a property or method of a null object reference.
 at KnockoutGame_fla::MainTimeline/selectArc()

All I want is for it to take the label of the current frame in the movie clip (which I defined already) and set it to a string, selectedChar.
This is my code;

this.stop();
var selectedChar:String = "";
var backMusic:SoundChannel;
var target:MovieClip;
var gameTimer:Timer = new Timer(1000,1);

p1c.gotoAndStop("Adeiza");
target = p1c;

backMusic= (new BackMusic2()).play();
available = new Array(2,3,4,5);

sButton.addEventListener(MouseEvent.CLICK, selectArc);

gameTimer.addEventListener(TimerEvent.TIMER, game);

function game(evt:TimerEvent):void {
nextFrame();
}
function selectArc(evt:MouseEvent):void {
selectedChar=target.currentFrameLabel;
gameTimer.start();
}

p1c is an instance of the movieClip containing the characters. I'd really appreciate any help or ideas. Thanks

[cancerinform]

What do you get when you trace selectedChar or gameTimer?

[sodiumbadams]

Oh wow cancerinform... You rule!! I traced them and got null for both, but my main problem was the gameTimer. What it was, I defined gameTimer and all methods in frame 1 of layer A, that extends to frame 4 without a new keyframe(dunno if I explained that well) and called them from frame 4 in layer B, which has 4 keyframes all through. What I had to do was define gameTimer's 'properties' again in frame 4. Thanks again for more words of wisdom!!