Animate movie clip of external SWF file

programming flash
1

ok,

using AS3 and “Tweener”, I want to animate a movie clip of a loaded SWF.

However, i want to do this from the code of the main movie, no code in external SWF.

Here is my loader:

var _swfContainer:Loader = new Loader()
var _url1:URLRequest = new URLRequest("about.swf")
var _url2:URLRequest = new URLRequest("portfolio.swf")

var _externalMovie:MovieClip;

//Start loading and add the loader to the stage
stage.addChild(_swfContainer);
_swfContainer.contentLoaderInfo.addEventListener(flash.events.Event.COMPLETE, finishedLoading);

// This is done after the swf is loaded
function finishedLoading (e:Event)
{
    _externalMovie = MovieClip(_swfContainer.content);
}

function loadAbout(e:Event){
	
		_swfContainer.load(_url1)
}

function loadPortfolio(e:MouseEvent){
	
		_swfContainer.load(_url2)
}

Here is the Tweener code:

Tweener.addTween(_externalMovie.ip, {x:244, time:0.4, delay:0.3, transition:"easeOutExpo"});

the “_externalMovie.ip” would refrence any external SWF that has been loaded with the movie clip “ip”, at least that is what I want

This is the error i get:
Error #1009: Cannot access a property or method of a null object reference.
at main_fla::MainTimeline/frame1()

Yes, i have my flash prefrences set up to access the Tweener class.