Acessar tags xml

Olá.

tenho uma action que acessa um xml. a action no frame 2 é essa:

stop();
/ arrays to hold the info /

var anuncio_arr:Array = [];
var tipo_arr:Array = [];
var titulo_arr:Array = [];
var texto_arr:Array = [];
var foto_arr:Array = [];
var credito_arr:Array = [];
//var url_arr:Array = [];
var imagesClips_arr:Array = [];

/ load the xml /

var xml_url:String = "xml/xml01.xml";
var news_data:XML = new XML();
var news_url:URLRequest = new URLRequest(xml_url);
var newsLoader:URLLoader = new URLLoader(news_url);
newsLoader.addEventListener(Event.COMPLETE, newsLoaded);
function newsLoaded(e:Event):void

{

	news_data = XML(newsLoader.data);
	//recorrer el xml
	var allNews:XMLList = news_data.*;
	for each (var news:XML in allNews)
	{
 anuncio_arr.push(news.anuncio.toString());
 tipo_arr.push(news.ticker.tipo.toString());
 titulo_arr.push(news.ticker.titulo.toString());
 texto_arr.push(news.ticker.texto.toString());
 foto_arr.push(news.ticker.foto.toString());
 credito_arr.push(news.ticker.credito.toString());
 //url_arr.push(news.url.toString());
	}
	//
	loadImages();
}

/ preload the images and add it to empty movieclips /

var count:int = 0;

function loadImages():void

{

	var toLoad:int = foto_arr.length;
	if (count > toLoad-1)
	{
 gotoAndStop("display");
	}
	else
	{
 preloader_txt.text = "preloading image "+(count+1);
 //here load the image
 var mc:MovieClip = new MovieClip;
 imagesClips_arr.push(mc);

 var img_url:String = "images/"+foto_arr[count];
 var loader:Loader = new Loader();
 var request_url:URLRequest = new URLRequest(img_url);

 loader.load(request_url);
 loader.contentLoaderInfo.addEventListener(Event.COMPLETE, completeListener);

 function completeListener(e:Event):void
 {
 mc.addChild(loader.content);
 }
 count++;
 loadImages();
	}
}

e no frame 3:

stop();

/ ini variables /

var activeNews:int = 0;
var isPlaying:Boolean = true;
var totalNews:int = titulo_arr.length;

/ timer /

var timer:Timer = new Timer(15000, 0);
timer.addEventListener(TimerEvent.TIMER, timerListener);

function timerListener(e:TimerEvent)

{

	if (activeNews == totalNews-1)
	{
 loadNews(0);
	}
	else
	{
 loadNews(activeNews+1);
	}
	//trace("running!!");
}

timer.start();

/ load the news /

function loadNews(num:int):void
{

	activeNews = num;
	//hide the buttons
	IMGloader_mc.goto_btn.enabled = false;
	prev_btn.enabled = false;
	next_btn.enabled = false;

	IMGloader_mc.holder_mc.addChild(imagesClips_arr[num]);

	display_mc.title_txt.text = titulo_arr[num];
	display_mc.desc_txt.text = texto_arr[num];
	display_mc.tipo_txt.text = tipo_arr[num];
	display_mc.credito_txt.text = credito_arr[num];

	IMGloader_mc.goto_btn.enabled = true;
	prev_btn.enabled = true;
	next_btn.enabled = true;

	//IMGloader_mc.link = url_arr[num];

}

/ next prev and pause /

prev_btn.addEventListener(MouseEvent.CLICK, prevListener);
function prevListener(e:MouseEvent):void

{

	if (activeNews == 0)
	{
 loadNews(totalNews-1);
	}
	else
	{
 loadNews(activeNews-1);
	}
}

next_btn.addEventListener(MouseEvent.CLICK, nextListener);
function nextListener(e:MouseEvent):void

{

	if (activeNews == totalNews-1)
	{
 loadNews(0);
	}
	else
	{
 loadNews(activeNews+1);
	}
}

pause_btn.addEventListener(MouseEvent.CLICK, pauseListener);
function pauseListener(e:MouseEvent):void

{

	if (isPlaying)
	{
 isPlaying = false;
 timer.stop();
 //
 pause_btn.alpha = 0.8;
	}
	else
	{
 isPlaying = true;
 timer.start();
 //
 pause_btn.alpha = 1;
	}
}

/ load the first news /

loadNews(0);
Está dando o erro:

SecurityError: Error #2000: Não há contexto de segurança ativo.

Esqueci de postar a estrutura do xml:

<?xml version="1.0" encoding="iso-8859-1"?>
<ticker>
<anuncio>

t1

<ticker>
<tipo>teste</tipo>
<texto>fdasd</texto>
<foto>test1.jpg</foto>
<credito>c2</credito>
<datainicio>4/7/2013</datainicio>
<datafim>4/7/2013</datafim>
</ticker>
<ticker>
<tipo>teste</tipo>
<texto>sadsad</texto>
<foto>test2.jpg</foto>
<credito>asfdsad</credito>
<datainicio>4/7/2013</datainicio>
<datafim>4/7/2013</datafim>
</ticker>
</anuncio>
</ticker>