Flash错误（错误＃2044：未处理的IOErrorEvent：。text =错误＃2124：已加载的文件是未知类型。）

Question

尝试制作导航到不同电影的菜单，但每次点击我都会收到此错误

  

错误＃2044：未处理的IOErrorEvent：。 text =错误＃2124：加载的文件是未知类型。

点击后

进入空白屏幕。

mama_btn.addEventListener(MouseEvent.CLICK, NavigateMama);

function NavigateMama(event:MouseEvent):void
{
//Optional but often needed. Stop the sounds for this page 
//before going to another page
SoundMixer.stopAll();

//To do navigation we need to call upon 2 Flash function libraries
var newdoc:URLRequest = new URLRequest("Mama.swf");
var loader:Loader = new Loader();
//This line loads the new page but it is invisible
loader.load(newdoc);
//We add the new page to the stage and now we have 
//both old and new pages mixed up on the stage - UGLY!
stage.addChild(loader);
//Clear out the old page to make way for the new.
stage.removeChildAt(0);
}

我在我的智慧结束时，我从adobe网站上取下了这个。任何人都有答案让它成功吗？