Actionscript 3 Keep getting TypeError:Error#2007:参数子项必须为非null。ActionScript3.0

我不断地发现这个错误：

TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/addChild()
at ChristmasGame_fla::MainTimeline/frame4()
at flash.display::MovieClip/gotoAndStop()
at ChristmasGame_fla::MainTimeline/onClickMenu2()

我有一个使用Actionscript添加childs的框架。此菜单中有7个级别，每个级别在单击时使用gotoAndStop（）播放所选级别

如果我选择level1，这很好，但是任何2-7都会给出上面的错误。不知道为什么，需要帮忙吗

下面的代码非常混乱：错误解决后将被清除

stop();

var day1click:Day1Click = new Day1Click();
var day2click:Day2Click = new Day2Click();
var day3click:Day3Click = new Day3Click();
var day4click:Day4Click = new Day4Click();
var day5click:Day5Click = new Day5Click();
var day6click:Day6Click = new Day6Click();
var day7click:Day7Click = new Day7Click();
var menubg:MenuBG = new MenuBG();
var menutitle:MenuTitle = new MenuTitle();

addChild(menubg);
addChild(menutitle);
menutitle.x = 338.80;
menutitle.y = 71.25;
addChild(day1click);
day1click.x = 332.80;
day1click.y = 208.5;
addChild(day2click);
day2click.x = 567.80;
day2click.y = 208.50;
addChild(day3click);
day3click.x = 796.80;
day3click.y = 208.50
addChild(day4click);
day4click.x = 334.80;
day4click.y = 362.10;
addChild(day5click);
day5click.x = 567.80;
day5click.y = 362.95;
addChild(day6click);
day6click.x = 797.80;
day6click.y = 362.95;
addChild(day7click);
day7click.x = 567.80;
day7click.y = 506.75

day1click.addEventListener(MouseEvent.CLICK, onClickMenu1);
function onClickMenu1(event:MouseEvent):void{
    removeChild(menubg);
    removeChild(menutitle);
    removeChild(day1click);
    removeChild(day2click);
    removeChild(day3click);
    removeChild(day4click);
    removeChild(day5click);
    removeChild(day6click);
    removeChild(day7click);
    day1click.removeEventListener(MouseEvent.CLICK, onClickMenu1);
    day2click.removeEventListener(MouseEvent.CLICK, onClickMenu2);
    day3click.removeEventListener(MouseEvent.CLICK, onClickMenu3);
    day4click.removeEventListener(MouseEvent.CLICK, onClickMenu4);
    day5click.removeEventListener(MouseEvent.CLICK, onClickMenu5);
    day6click.removeEventListener(MouseEvent.CLICK, onClickMenu6);
    day7click.removeEventListener(MouseEvent.CLICK, onClickMenu7);
    gotoAndStop('day1');
}

day2click.addEventListener(MouseEvent.CLICK, onClickMenu2);
function onClickMenu2(event:MouseEvent):void{
    removeChild(menubg);
    removeChild(menutitle);
    removeChild(day1click);
    removeChild(day2click);
    removeChild(day3click);
    removeChild(day4click);
    removeChild(day5click);
    removeChild(day6click);
    removeChild(day7click);
    day1click.removeEventListener(MouseEvent.CLICK, onClickMenu1);
    day2click.removeEventListener(MouseEvent.CLICK, onClickMenu2);
    day3click.removeEventListener(MouseEvent.CLICK, onClickMenu3);
    day4click.removeEventListener(MouseEvent.CLICK, onClickMenu4);
    day5click.removeEventListener(MouseEvent.CLICK, onClickMenu5);
    day6click.removeEventListener(MouseEvent.CLICK, onClickMenu6);
    day7click.removeEventListener(MouseEvent.CLICK, onClickMenu7);
    gotoAndStop('day2');
}

day3click.addEventListener(MouseEvent.CLICK, onClickMenu3);
function onClickMenu3(event:MouseEvent):void{
    removeChild(menubg);
    removeChild(menutitle);
    removeChild(day1click);
    removeChild(day2click);
    removeChild(day3click);
    removeChild(day4click);
    removeChild(day5click);
    removeChild(day6click);
    removeChild(day7click);
    day1click.removeEventListener(MouseEvent.CLICK, onClickMenu1);
    day2click.removeEventListener(MouseEvent.CLICK, onClickMenu2);
    day3click.removeEventListener(MouseEvent.CLICK, onClickMenu3);
    day4click.removeEventListener(MouseEvent.CLICK, onClickMenu4);
    day5click.removeEventListener(MouseEvent.CLICK, onClickMenu5);
    day6click.removeEventListener(MouseEvent.CLICK, onClickMenu6);
    day7click.removeEventListener(MouseEvent.CLICK, onClickMenu7);
    gotoAndStop('day3');
}

day4click.addEventListener(MouseEvent.CLICK, onClickMenu4);
function onClickMenu4(event:MouseEvent):void{
    removeChild(menubg);
    removeChild(menutitle);
    removeChild(day1click);
    removeChild(day2click);
    removeChild(day3click);
    removeChild(day4click);
    removeChild(day5click);
    removeChild(day6click);
    removeChild(day7click);
    day1click.removeEventListener(MouseEvent.CLICK, onClickMenu1);
    day2click.removeEventListener(MouseEvent.CLICK, onClickMenu2);
    day3click.removeEventListener(MouseEvent.CLICK, onClickMenu3);
    day4click.removeEventListener(MouseEvent.CLICK, onClickMenu4);
    day5click.removeEventListener(MouseEvent.CLICK, onClickMenu5);
    day6click.removeEventListener(MouseEvent.CLICK, onClickMenu6);
    day7click.removeEventListener(MouseEvent.CLICK, onClickMenu7);
    gotoAndStop('day4');
}

day5click.addEventListener(MouseEvent.CLICK, onClickMenu5);
function onClickMenu5(event:MouseEvent):void{
    removeChild(menubg);
    removeChild(menutitle);
    removeChild(day1click);
    removeChild(day2click);
    removeChild(day3click);
    removeChild(day4click);
    removeChild(day5click);
    removeChild(day6click);
    removeChild(day7click);
    day1click.removeEventListener(MouseEvent.CLICK, onClickMenu1);
    day2click.removeEventListener(MouseEvent.CLICK, onClickMenu2);
    day3click.removeEventListener(MouseEvent.CLICK, onClickMenu3);
    day4click.removeEventListener(MouseEvent.CLICK, onClickMenu4);
    day5click.removeEventListener(MouseEvent.CLICK, onClickMenu5);
    day6click.removeEventListener(MouseEvent.CLICK, onClickMenu6);
    day7click.removeEventListener(MouseEvent.CLICK, onClickMenu7);
    gotoAndStop('day5');
}

day6click.addEventListener(MouseEvent.CLICK, onClickMenu6);
function onClickMenu6(event:MouseEvent):void{
    removeChild(menubg);
    removeChild(menutitle);
    removeChild(day1click);
    removeChild(day2click);
    removeChild(day3click);
    removeChild(day4click);
    removeChild(day5click);
    removeChild(day6click);
    removeChild(day7click);
    day1click.removeEventListener(MouseEvent.CLICK, onClickMenu1);
    day2click.removeEventListener(MouseEvent.CLICK, onClickMenu2);
    day3click.removeEventListener(MouseEvent.CLICK, onClickMenu3);
    day4click.removeEventListener(MouseEvent.CLICK, onClickMenu4);
    day5click.removeEventListener(MouseEvent.CLICK, onClickMenu5);
    day6click.removeEventListener(MouseEvent.CLICK, onClickMenu6);
    day7click.removeEventListener(MouseEvent.CLICK, onClickMenu7);
    gotoAndStop('day6');
}

day7click.addEventListener(MouseEvent.CLICK, onClickMenu7);
function onClickMenu7(event:MouseEvent):void{
    removeChild(menubg);
    removeChild(menutitle);
    removeChild(day1click);
    removeChild(day2click);
    removeChild(day3click);
    removeChild(day4click);
    removeChild(day5click);
    removeChild(day6click);
    removeChild(day7click);
    day1click.removeEventListener(MouseEvent.CLICK, onClickMenu1);
    day2click.removeEventListener(MouseEvent.CLICK, onClickMenu2);
    day3click.removeEventListener(MouseEvent.CLICK, onClickMenu3);
    day4click.removeEventListener(MouseEvent.CLICK, onClickMenu4);
    day5click.removeEventListener(MouseEvent.CLICK, onClickMenu5);
    day6click.removeEventListener(MouseEvent.CLICK, onClickMenu6);
    day7click.removeEventListener(MouseEvent.CLICK, onClickMenu7);
    gotoAndStop('day7');
}

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跟踪调用addChild（）的每个项目

例如：

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唯一的例外是帮助不大。你能发布你创建这个多级菜单的代码吗？当然它很混乱，我会在我工作后清理它。请检查我对主帖子的编辑：您仅在主画布中添加菜单级别2、3、4等，即此.add（），但不是嵌套方式。i、 e.菜单级别2不在菜单级别2内。这就是你想做的吗？或者你需要在级别1下添加级别2，以此类推。本质上，它们都是要同时显示的，下面是它的视觉效果：最后一个问题……当你点击第1天，然后点击第2天，你会得到这个异常。点击第2天按钮，然后点击第1天，你会得到相同的错误。如果是这样，那么我有解决办法。请让我知道。

var childInstance:DisplayObject;
trace(childInstance);// if you see null then issue is found
addChild(childInstance);