Error 2025/ trying to removeChild()

Question

Hi,
I have tried to solve ths problem but without success. I have permit Debugging on so I know it s related to the removeChild().
I currently have four buttons that each call a different addChild() function. Everything works great. However, if I skim across the buttons the way someone would in eal life the error appears. I have tried different references to the stage or this or parent.removeChild(), but no luck.
Here is the output:
ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
    at flash.display::DisplayObjectContainer/removeChild()
    at flutePlayer_main_fla::MainTimeline/removeGraphicD()[flutePlayer_main_fla.MainTimeline::fr ame1:79]
ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
    at flash.display::DisplayObjectContainer/removeChild()
    at flutePlayer_main_fla::MainTimeline/removeGraphicC()[flutePlayer_main_fla.MainTimeline::fr ame1:61]
ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
    at flash.display::DisplayObjectContainer/removeChild()
    at flutePlayer_main_fla::MainTimeline/removeGraphic()[flutePlayer_main_fla.MainTimeline::fra me1:26]
ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
    at flash.display::DisplayObjectContainer/removeChild()
    at flutePlayer_main_fla::MainTimeline/removeGraphicB()[flutePlayer_main_fla.MainTimeline::fr ame1:43]
Here is the code:
stop();
var aGraphics:MovieClip = new GraphicsA();
var lowC1:MovieClip = new LowC1();
var graphicA2:MovieClip = new GraphicsA2();
var graphA3:MovieClip = new GraphicsA3();
lowA_btn.addEventListener(MouseEvent.MOUSE_DOWN, playLowA);
lowA_btn.addEventListener(MouseEvent.MOUSE_OUT, removeGraphic);
function playLowA(evt:MouseEvent):void {
    play();
    addChild(aGraphics);
    aGraphics.x=400;
    aGraphics.y=180;
function removeGraphic(evt:MouseEvent):void {
    removeChild(aGraphics);
    removeEventListener(MouseEvent.MOUSE_OUT, playLowA);
lowC1_btn.addEventListener(MouseEvent.MOUSE_DOWN, playLowC1);
lowC1_btn.addEventListener(MouseEvent.MOUSE_OUT, removeGraphicB);
function playLowC1(evt:MouseEvent):void {
    play();
    addChild(lowC1);
    lowC1.x=400;
    lowC1.y=170;
function removeGraphicB(evt:MouseEvent):void {
    removeChild(lowC1);
    removeEventListener(MouseEvent.MOUSE_OUT, playLowC1);
A2_btn.addEventListener(MouseEvent.MOUSE_DOWN, playA2);
A2_btn.addEventListener(MouseEvent.MOUSE_OUT, removeGraphicC);
function playA2(evt:MouseEvent):void {
    play();
    addChild(graphicA2);
    graphicA2.x=400;
    graphicA2.y=165;
function removeGraphicC(evt:MouseEvent):void {
    removeChild(graphicA2);
    removeEventListener(MouseEvent.MOUSE_OUT, playA2);
A3_btn.addEventListener(MouseEvent.MOUSE_DOWN, playA3);
A3_btn.addEventListener(MouseEvent.MOUSE_OUT, removeGraphicD);
function playA3(evt:MouseEvent):void {
    play();
    addChild(graphA3);
    graphA3.x=400;
    graphA3.y=165;
function removeGraphicD(evt:MouseEvent):void {
    removeChild(graphA3);
    removeEventListener(MouseEvent.MOUSE_OUT, playA3);
Thanks for your help.

Answer 1

Ok, After trying different approaches I changed my MOUSE_ DOWN to MOUSE_OVER which made the difference.
I think I get it. When skimming the mouse activates the button for a slit second. Since there was no code for the over state it throws an error and the remeoveChild() is probably just a ruse.
I'm sure there is someone who knows the real answer.
Thanks again.
The new code:
stop();
import flash.media.SoundMixer;
var aGraphics:MovieClip = new GraphicsA();
var lowC1:MovieClip = new LowC1();
var graphicA2:MovieClip = new GraphicsA2();
var graphA3:MovieClip = new GraphicsA3();
lowA_btn.addEventListener(MouseEvent.MOUSE_OVER, playLowA);
lowA_btn.addEventListener(MouseEvent.MOUSE_UP, noSound);
lowA_btn.addEventListener(MouseEvent.MOUSE_OUT, removeGraphic);
function playLowA(evt:MouseEvent):void {
    play();
    addChild(aGraphics);
    aGraphics.x=400;
    aGraphics.y=180;
function noSound(evt:MouseEvent):void{
    SoundMixer.stopAll();
function removeGraphic(evt:MouseEvent):void {
    removeChild(aGraphics);
    removeEventListener(MouseEvent.MOUSE_OUT, playLowA);
lowC1_btn.addEventListener(MouseEvent.MOUSE_OVER, playLowC1);
lowC1_btn.addEventListener(MouseEvent.MOUSE_UP, noSoundB);
lowC1_btn.addEventListener(MouseEvent.MOUSE_OUT, removeGraphicB);
function playLowC1(evt:MouseEvent):void {
    play();
    addChild(lowC1);
    lowC1.x=400;
    lowC1.y=170;
function noSoundB(evt:MouseEvent):void{
    SoundMixer.stopAll();
function removeGraphicB(evt:MouseEvent):void {
    removeChild(lowC1);
    removeEventListener(MouseEvent.MOUSE_OUT, playLowC1);
A2_btn.addEventListener(MouseEvent.MOUSE_OVER, playA2);
A2_btn.addEventListener(MouseEvent.MOUSE_UP, noSoundC);
A2_btn.addEventListener(MouseEvent.MOUSE_OUT, removeGraphicC);
function playA2(evt:MouseEvent):void {
    play();
    addChild(graphicA2);
    graphicA2.x=400;
    graphicA2.y=165;
function noSoundC(evt:MouseEvent):void{
    SoundMixer.stopAll();
function removeGraphicC(evt:MouseEvent):void {
    removeChild(graphicA2);
    removeEventListener(MouseEvent.MOUSE_OUT, playA2);
A3_btn.addEventListener(MouseEvent.MOUSE_OVER, playA3);
A3_btn.addEventListener(MouseEvent.MOUSE_UP, noSoundD);
A3_btn.addEventListener(MouseEvent.MOUSE_OUT, removeGraphicD);
function playA3(evt:MouseEvent):void {
    play();
    addChild(graphA3);
    graphA3.x=400;
    graphA3.y=165;
function noSoundD(evt:MouseEvent):void{
    SoundMixer.stopAll();
function removeGraphicD(evt:MouseEvent):void {
    removeChild(graphA3);
    removeEventListener(MouseEvent.MOUSE_OUT, playA3);