[Flashcoders] RangeError: Error #2006: The supplied index is out of bounds.

[anuj sharma]

Hi Guys
I am making an Auto-Arrange button and clicking on which arranges all the
children of the container( which are on the main stage) in the tile format.
Basically on clicking, I manually move those child on the stage to
particular coordinates as shown in my code. I have pasted my code below. My
problem is that as soon as i click on the auto arrange button I am getting
error "RangeError: Error #2006: The supplied index is out of bounds.".
Please let me know what i am doing wrong and i will appreciate if you let me
know how would i fix this
Thanks a lot guys
Anuj

******************CODE**********************
var aa:Number=0;
var xcoord:Number=-300;
var ycoord:Number=-200;
var xcoord1:Number=450;
 var xcoord2:Number=850;
 var xcoord3:Number=1250;
var ycoord1:Number=350;
 var ycoord2:Number=650;
//Button Listener
btn_AA.addEventListener(MouseEvent.CLICK,autoArrange);
function autoArrange(event:MouseEvent):void
{
    if(container.getChildAt(aa)!=null)
    {
    container.getChildAt(aa).x=xcoord;
    container.getChildAt(aa).y=ycoord;
    //Arrange Second
    container.getChildAt(aa+1).x=xcoord+xcoord1;
    container.getChildAt(aa+1).y=ycoord;
    //Arrange Third
    container.getChildAt(aa+2).x=xcoord+ xcoord2;
    container.getChildAt(aa+2).y=ycoord;
    //Arrange Forth
    container.getChildAt(aa+3).x=xcoord+xcoord3;
    container.getChildAt(aa+3).y=ycoord;
    //Arrange Fifth
    container.getChildAt(aa+4).x=xcoord;
    container.getChildAt(aa+4).y=ycoord+ycoord1;
    //Arrange Sixth
    container.getChildAt(aa+5).x=xcoord+xcoord1;
    container.getChildAt(aa+5).y=ycoord+ycoord1;
    //Arrange Seventh
    container.getChildAt(aa+6).x=xcoord+ xcoord2;
    container.getChildAt(aa+6).y=ycoord+ycoord1;
    //Arrange Eight
    container.getChildAt(aa+7).x=xcoord+xcoord3;
    container.getChildAt(aa+7).y=ycoord+ycoord1;
    //Arrange Ninth
    container.getChildAt(aa+8).x=xcoord;
    container.getChildAt(aa+8).y=ycoord+ycoord2;
    //Arrange Tenth
    container.getChildAt(aa+9).x=xcoord+xcoord1;
    container.getChildAt(aa+9).y=ycoord+ycoord2;
    //Arrange Eleventh
    container.getChildAt(aa+10).x=xcoord+ xcoord2;
    container.getChildAt(aa+10).y=ycoord+ycoord2;
    }
}
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