Flash ActionScript 3顺序swf上传器问题

Question

我想创建swf文件，按顺序加载所有其他1.swf，2.swf，3,4等等，然后再循环到第一个。

问题：这是输出＆＃34;准备调用eFrame TypeError：错误＃1009：无法访问空对象引用的属性或方法。     在main_fla :: MainTimeline / eFrame（）＆＃34;

这就是我所拥有的（BTW它不是我的代码:)问题是在这部分代码中

  

mcExternal = loader.content as MovieClip;   var current：int = mcExternal.currentFrame;   var total：int = mcExternal.totalFrames;

import flash.display.MovieClip;

var rq:URLRequest;
var loader:Loader= new Loader();
stage.addChild(loader);

var numOfMovies:int = 3;
var path:String = "mov/";
var myMovies:Array=["1.swf","2.swf", "3.swf"];
var movieNum:int=1;
var mcExternal:MovieClip;

/*Load Req*/
function loadSWF():void {
    var tPath:String = path + movieNum;
    rq=new URLRequest(tPath + ".swf");
    loader.load(rq);

    // waiting for the loader to be ready
    loader.contentLoaderInfo.addEventListener(Event.COMPLETE,onComplet);

}
/*Load Req*/


function onComplet(e:Event):void {
    loader.contentLoaderInfo.removeEventListener(Event.COMPLETE,onComplet);
    trace("ready to call eFrame");
    stage.addEventListener(Event.ENTER_FRAME, eFrame);
}


function eFrame(e:Event):void {
    mcExternal= loader.content as MovieClip;
    var current:int=mcExternal.currentFrame;
    var total:int=mcExternal.totalFrames;

    /*trace(current);
    trace(total);*/

    if (current >= total) {
        trace("Load next swf ");
        loader.unloadAndStop();

        mcExternal=null;
        movieNum++;
        stage.removeEventListener(Event.ENTER_FRAME, eFrame);
        rq=null;
        loadSWF();

        if (movieNum>=numOfMovies) {
            movieNum=0;
        }
    }
}


loadSWF();