Loading library.swf (unpacked from swc) using loader() and using it's assets

Question

I try to load libary.swf from an swc file in order to use it's library items.
i load the library.swf using urlrequest and loader() and then use getDefinition() to fetch the class definition
of the UIMovieclip element.
i simply created the swc file by adding library assets to an swf file, converting them to a flex component and extending each compoent with the UIMovieClip class.
when i load the swf file from a url (http) i get the following error:
VerifyError: Error #1053: Illegal override of UIMovieClip in mx.flash.UIMovieClip.
when i load the file locally, i get no error. any ideas why?
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" creationComplete="init()">
    <fx:Script>
        <![CDATA[
            import mx.core.UIComponent;
            import mx.flash.UIMovieClip;
            private var _context: LoaderContext;
            private var _request: URLRequest;
            private var _loader:Loader;
            private var _library:Object;
            private var _executeFunction:Function = null;
            public function _setExecuteFunction(f:Function):void {
                this._executeFunction=f;
            public function handleLibInitialized(e:Event):void {
                this._library=e.target.applicationDomain;
                var a:Class = this._library.getDefinition("lobby_page_component");
                var b:MovieClip = new a() as MovieClip;
                var c:UIComponent = new UIComponent();
                c.addChild(b);
                this.addElement(c);
            public function init():void {
                Security.allowDomain("*");
                var url2:String="http://url/for/library.swf"; <- http provides an error
                 var url2:String="/path/to/library.swf"; <- local path works
                             this._context = new LoaderContext(false,ApplicationDomain.currentDomain);
                this._request = new URLRequest(url2);
                this._loader = new Loader();
                this._loader.contentLoaderInfo.addEventListener(Event.INIT,this.handleLibInitialized);
                this._loader.load(this._request,this._context);
        ]]>
    </fx:Script>
</s:Application>

Answer 1

hello,
thanks for trying to help.
if this is the case, why it happens only when i load the library.swf file from an http location instead of a local location ?
how can i make sure that my adobe flash has the same UIMovieClip version?
kfir