TypeError: Error #1034 - Want to display a swf

Question

Hi,
I´m new to AS3 and try to load/display swf´s on the stage. The swf´s should run and if the user clicks a button the next swf should be displayed.
That works so far if I use some swf´s that are created also with FlashPlayer 9 and AS3. But if I use a swf created by someone else I get a TypeError: Error #1034. So far, I have no idea why this happens. Maybe you can have a look at my code and give me a hint. Thanks in advance.
var configfile = "test.xml";
var xml_url:String = configfile;
var urlLoader:URLLoader = new URLLoader();
urlLoader.addEventListener(Event.COMPLETE, setClips);
var xml:XML;
var currentClip:int = 0;
var clips:Array = new Array(); btnPrevious.addEventListener(MouseEvent.CLICK, previousClip);
setChildIndex(btnPrevious,1);
btnNext.addEventListener(MouseEvent.CLICK, nextClip);    
setChildIndex(btnNext,1);
function setClips(e:Event) {
    this.xml = new XML(e.target.data);
    this.playClip(this.currentClip);
function playClip(index:Number) {              
    if (!this.clips[index]) {           
        var request:URLRequest = new URLRequest(this.xml.item[index]);           
        var loader:Loader = new Loader();
        loader.contentLoaderInfo.addEventListener(Event.COMPLETE, this.setMovieClip);    
        loader.load(request);
    else {
        this.currentClip = index;              
     this.clips[this.currentClip].play();    
        this.addChild(this.clips[this.currentClip]);
        setChildIndex(this.clips[this.currentClip],0);              
        this.clips[this.currentClip].addEventListener(Event.ENTER_FRAME, this.onEnterFrameCheck);
function nextClip(e:MouseEvent) {
     this.clips[this.currentClip].gotoAndStop(0);
        this.removeChild(this.clips[this.currentClip]);
     this.currentClip = this.currentClip + 1;    
     if(this.currentClip == this.xml.item.length()) {
          this.currentClip = 0;
     this.playClip(this.currentClip);    
function previousClip(e:MouseEvent) {
    this.clips[this.currentClip].gotoAndStop(0);
    this.removeChild(this.clips[this.currentClip]);
    this.currentClip = this.currentClip - 1;
    if(this.currentClip == -1) {
       this.currentClip = this.xml.item.length() - 1;    }         this.playClip(this.currentClip);    
function setMovieClip(e:Event):void {    this.clips[this.currentClip] = MovieClip(e.target.loader.content);
    this.addChild(this.clips[this.currentClip]);
    setChildIndex(this.clips[this.currentClip],0);  
    this.clips[this.currentClip].addEventListener(Event.ENTER_FRAME, this.onEnterFrameCheck);
function onEnterFrameCheck(e:Event):void {
    if(this.clips[this.currentClip] && this.clips[this.currentClip].currentFrame == this.clips[this.currentClip].totalFrames) {
        this.clips[this.currentClip].gotoAndStop(0);    
        this.clips[this.currentClip].removeEventListener(Event.ENTER_FRAME, this.onEnterFrameCheck);         
        this.removeChild(this.clips[this.currentClip]);    
        if(this.currentClip >= this.xml.item.length()-1) {
             this.currentClip = -1;
     }                               this.currentClip++;              
        this.playClip(this.currentClip);
urlLoader.load(new URLRequest(this.xml_url)); 
stop();
And here The XML:
<banners>
<item>banner1.swf</item>
<item>banner2.swf</item>
<item>banner3.swf</item>
</banners>
The full Error Message (In German:)
TypeError: Error #1034: Typumwandlung fehlgeschlagen: flash.display::AVM1Movie@34d4df9 kann nicht in flash.display.MovieClip umgewandelt werden.
    at teaser_fla::MainTimeline/setMovieClip()

Answer 1

The problem will be related to trying to manipulate an AS1/AS2 file using AS3... it cannot be done.  In this case, you are probably just seeing the first of a few errors where you try to manipulate an AS2 object by trying to cast it as an AS3 MovieClip object.  You would run into problems later when you try controlling/reading that same file (currentFrame is not an AS1/AS2 property, but you attempt to extract it).
Per the Flash Help documentation...
"ActionScript 3.0 code can load a SWF file written in ActionScript 1.0 or 2.0, but it cannot access the SWF file's variables and functions. "
You can implement the LocalConnection class to overcome some of the issues, but if you are using other people's files, you are likely to hit a wall...
"LocalConnection objects created in ActionScript 3.0 can communicate with LocalConnection objects created in ActionScript 1.0 or 2.0.
The reverse is also true: LocalConnection objects created in ActionScript 1.0 or 2.0 can communicate with LocalConnection objects created in ActionScript 3.0. Flash Player handles this communication between LocalConnection objects of different versions automatically."