Error #1034 while running flash application - actionscript-3

Question

Alright, I know that this error is occurring because of something to do with addchild() function. On frame 2. How do I know? Because when I remove the snippets of code that dynamically place an object onto the stage it works fine. The error is below and the source code for frame 2 is below the error messages.
Error Code
TypeError: Error #1034: Type Coercion failed: cannot convert 0 to flash.display.DisplayObject.
at fl.motion::AnimatorBase/play()
at fl.motion::AnimatorBase$/processCurrentFrame()
at fl.motion::AnimatorBase/handleEnterFrame()
at flash.display::MovieClip/nextFrame()
at Lemonade_fla::MainTimeline/begin()[Lemonade_fla.MainTimeline::frame1:27]
TypeError: Error #1034: Type Coercion failed: cannot convert 0 to
FRAME 2 CODE
flash.display.DisplayObject.
stop();
var guide_tut:guide = new guide();
addChild(guide_tut);
//stand.addEventListener(MouseEvent.CLICK, check);
addEventListener(Event.ENTER_FRAME, check);
function check(ev : Event) : void {
cash.text.text = cash1;
lemons_count.text.text = lemons1;
cups_count.text.text = cups;
straws_count.text.text = straws;
ice_count.text.text = ice;
}
shop_mc.addEventListener(MouseEvent.CLICK, shopnow);
function shopnow(event:MouseEvent):void{
nextFrame();
}

Answer 1

1) I ran your code it works fine, the only place the error could be generated is:
flash.display.DisplayObject.
should be: flash.display.DisplayObject;
but you don't need it.
and
var guide_tut:guide = new guide();
addChild(guide_tut);
I ran it with just an empty mc, it works fine.
2) no reason to have (i know its commented out) but there never a reason to have
stand.addEventListener(MouseEvent.CLICK, check) ever since check is EnterFrame
basically you're error is within either display, most likely you're not extending the class from MovieClip
public class guide extends MovieClip
instead of movieclip it can be sprite or other displayobject...