[問題] Button連結出現錯誤 錯誤碼#1009

[sploo (sploo)]

我用button載入另外一個SWF檔出現以下文字

"TypeError: Error #1009: 無法存取 Null 物件參考的屬性或方法。
    at portfolio_fla::MainTimeline/a()"

語法:
import flash.display.Loader;
import flash.net.URLRequest;

var myLoader:Loader=new Loader();

b1.addEventListener(MouseEvent.CLICK,show_pix6);
function show_pix6(event:MouseEvent):void
{
    gotoAndPlay(20);
}
b2.addEventListener(MouseEvent.CLICK,show_pix1);
function show_pix1(event:MouseEvent):void
{
    gotoAndPlay(36);
}
b3.addEventListener(MouseEvent.CLICK,show_pix2);
function show_pix2(event:MouseEvent):void
{
    gotoAndPlay(52);
}
b4.addEventListener(MouseEvent.CLICK,show_pix3);
function show_pix3(event:MouseEvent):void
{
    gotoAndPlay(68);
}
b5.addEventListener(MouseEvent.CLICK,show_pix4);
function show_pix4(event:MouseEvent):void
{
    gotoAndPlay(84);
}
b6.addEventListener(MouseEvent.CLICK,show_pix5);
function show_pix5(event:MouseEvent):void
{
    gotoAndPlay(100);
}

h.addEventListener(MouseEvent.CLICK,a);
function a(event:MouseEvent):void
{
    var myURL:URLRequest = new URLRequest("home.swf");
    loader.addChild(myLoader);
    myLoader.load(myURL);
}
b1~b6,h為button的名稱

我在另一個檔案執行
h.addEventListener(MouseEvent.CLICK,a);
function a(event:MouseEvent):void
{
    var myURL:URLRequest = new URLRequest("home.swf");
    loader.addChild(myLoader);
    myLoader.load(myURL);
}
不會有這個問題
有上網查些資料
是說stage沒有載入資料所以為null會有錯
請問哪裡有寫錯 是不是跟b1~b6的button有衝到
謝謝

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→ scars:你的"另一個檔案"找的到loader跟myLoader嗎..?
→ sploo:有 寫在AS裡 var myLoader ; load_mc.addChild(myLoader);
→ sploo:var myLoader:Loader=new Loader();