Error #1009: Cannot access a property or method of a null object reference:presscheck

programming flash
1

Hullo…
A newbie here…and AS3…
Anyways…I was trying out AS3…when got this kinda error…

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at testCollision1_fla::MainTimeline/presscheck()

Anyways,…I created 2 sets of actions in 2 separate keyframes.
I just wanted to try playing in between the different frames…plus a few basic mouse-button interactions.

here’s a look at the first actionscript…/.

stop();
moveblock.addEventListener(MouseEvent.MOUSE_DOWN, startMove);
stage.addEventListener (Event.ENTER_FRAME, presscheck);
toKeyz.addEventListener(MouseEvent.MOUSE_UP, toNextKey);

function presscheck(event:Event):void
{
if(moveblock.hitTestPoint(mouseX, mouseY, true))
{
//trace(“they”);
checkTxt.text = "Help: " + “them”;
}
}

function startMove(evt:MouseEvent):void
{
moveblock.startDrag();
}

function toNextKey(evt:MouseEvent):void
{
gotoAndPlay(“keybord”);
}

moveblock.addEventListener(MouseEvent.MOUSE_UP, stopMove);

function stopMove(evt:MouseEvent):void
{
moveblock.stopDrag();
checkTxt.text = “Help: block noticed”;
if (bgwk.hitTestObject(moveblock))
{
trace(“hrthr”);
//moveblock.x = bgwk.x;
//moveblock.y = bgwk.y;
//rectangle

}

}

…and here’s the second action frame

stop();

btninviz.addEventListener(MouseEvent.MOUSE_UP, hidemouse);
btnvizy.addEventListener(MouseEvent.MOUSE_UP, showmouse);
//stage.addEventListener(Event.ENTER_FRAME, keepcsr);
toMose…addEventListener(MouseEvent.MOUSE_UP, back21);

function hidemouse(evt:MouseEvent):void
{
Mouse.hide();
}

function showmouse(evt:MouseEvent):void
{
Mouse.show();
}

function keepcsr(evt:Event):void
{
newcsr.x = mouseX;
newcsr.y = mouseY;
}

function back21 (evt:MouseEvent):void
{
gotoAndPlay(“mousse”);
}

here’s me attached fla file…
http://www.mediafire.com/?nmzrxynzkfw

did skim through a few forums in this Error #1009 problem…am still confused…the only thing I noticed is that the error occurs when i add in the presscheck() and keepcsr() functions…which I suspect that it’s related (I might have wrongly called/declared them) in the:

‘stage.addEventListener(Event.ENTER_FRAME, keepcsr);’, and
‘stage.addEventListener(Event.ENTER_FRAME, presscheck);’ lines…

Any ideas/suggestions to rectify them?