OH DEAR GOD PLEASE HELP W/ Button

For 3 day I've been trying to get this button to work with no luck.

my button name is next_btn.

The code I'm using in the actions layer of the MC with the button:

next_btn.addEventListener(MouseEvent.CLICK,onBtnCl ick);

function onBtnClick(event:MouseEvent):void{
this.overlay_mc.nextFrame()
}

The error I get:

TypeError: Error #1010: A term is undefined and has no properties.
at homeFeatureGallery_fla::nav_mc_5/onBtnClick()


I watch every tutoral, read every post and still cant get even this simple code to work. Is it suppose to be this hard!

Please help!

That error would seem to indicate that overlay_mc does not exist as a property of the movieclip in which that code is written. Common causes of this are that you are misinterpreting what "this" means, or that you have a child with name overlay_mc but not a corresponding property.

What is overlay_mc's parent? Was overlay_mc placed through the IDE, or through code?

Thank you, that was the issue I wasnt pointing to the correct MC