I'm getting the message, "the supplied index is out of bounds." i have attached my code and the error message. can anyone help me? thanks.

Question

the title is self-explanatory. i'm VERY new to flash so i don't understand a lot of the lingo. can anyone give me a simple answer or, better yet, fix the code for me? i'm reading that it usually comes up when there's a child error but i'm not sure how to fix it.
my code:
var navBtnGlow:GlowFilter = new GlowFilter(0x000000, 0.5, 0, 15, 1, 2, true, false);
navBAR_mc.addEventListener(MouseEvent.MOUSE_OVER, navOverF);
navBAR_mc.addEventListener(MouseEvent.MOUSE_OUT, navOutF);
function navOverF(event:MouseEvent):void{
event.target.filters = [navBtnGlow];
navBAR_mc.setChildIndex(event.target as MovieClip, 1);
dropMenus_mc.gotoAndStop(navBAR_mc.getChildAt(1).name);
trace("We are Rolled Over..." + navBAR_mc.getChildAt(1).name)
function navOutF(event:MouseEvent):void{
event.target.filters = [];
the error message:
RangeError: Error #2006: The supplied index is out of bounds.
at flash.display::DisplayObjectContainer/setChildIndex()
at bestPRIM_fla::MainTimeline/navOverF()
thanks in advance!

Answer 1

I'm trying to get my head around this, but here's my shot at it... you have an event listener assigned to navBAR_mc for a mouse over.  When the mouseover occurs, you have the following line:
navBAR_mc.setChildIndex(event.target as MovieClip, 1);
Since navBAR_mc is the event.target, it cannot be a child of itself, but I think that's what that line is trying (and failing) to process.
So can you describe what you are trying to do.  I would expect that navBAR_mc holds buttons, but based on what I see, it is the button.