ERR

Runtime errors in Flash 9.

I was stumped for quite a while this afternoon about the error:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
        at Flash5$/mouseMoveListener()

I just turned out that I had redeclared a variable inside the new() constructor, like this:

class Zoomer extends Sprite {

    private var box:Sprite;
    private var dragleft:Sprite;

    public function new() {
        super();

		var dragleft = new Sprite();
    }

    function mainMove (e:MouseEvent):Void {
	   dragleft.x = e.stageX;

}

That var shouldn't be in there, it should look like this:

class Zoomer extends Sprite {

    private var box:Sprite;
    private var dragleft:Sprite;

    public function new() {
        super();

		dragleft = new Sprite();
    }

    function mainMove (e:MouseEvent):Void {
	   dragleft.x = e.stageX;

}