addChild() issue: error 2007 on AS3 - actionscript-3

Question

I have this piece of code that's suppose to add a swf file (homePage.swf) inside my main file (skeleton.fla).
Code:
var mcHome:MovieClip;
var newPage:Loader = new Loader();
newPage.load(new URLRequest("homePage.swf"));
newPage.contentLoaderInfo.addEventListener(Event.COMPLETE, homeLoaded);
function homeLoaded(event:Event):void {
mcHome = MovieClip(newPage.contentLoaderInfo.content);
newPage.contentLoaderInfo.removeEventListener(Event.COMPLETE, homeLoaded);
addChild(mcHome);
}
I keep getting this error:
TypeError: Error #2007: Parameter child must be non-null. at
flash.display::DisplayObjectContainer/addChild() at
skeleton_fla::MainTimeline/homeLoaded()
I don't know how to solve it, or what to change!
Help please, I'm a bit desperate.

Answer 1

Is better to add to the displayList the Loader object instead its contentLoaderInfo.content. The Loader is a DisplayObject by itself. There is not need to access to the MovieClip inside of the Loader object although it is possible in the most of environments.
If you try to load an SWF that resides in other domain, you could add the Loader object to the displayList but you can't access to the content property if you don't create a crossdomain.xml file.
var newPage:Loader = new Loader();
newPage.load(new URLRequest("homePage.swf"));
newPage.contentLoaderInfo.addEventListener(Event.COMPLETE, homeLoaded);
function homeLoaded(event:Event):void {
newPage.contentLoaderInfo.removeEventListener(Event.COMPLETE, homeLoaded);
addChild(newPage);
}
Here you have an example.