Access Text Field in external swf

programming flash
1

Hi, I am loading an external swf and need to access the text fields within it.

mc.test_txt.htmlText = “new text here”; Have tried this but get the following error:
Error #1010: A term is undefined and has no properties.

s2.as
package pages
{
import flash.display.;
import flash.events.;
import flash.media.;
import flash.net.;
import flash.text.*;

public class s2 extends pages.pageLoader
{    
    
    public function s2()
    {
        super();
        return;
    }
    
    //loads page
    public function loadPage():void
    {
        _swfURL = "./swf/300_S2.swf";
        _xmlURL = "./xml/S2.xml";
        //function loads external swf file
        loadSWF(_swfURL);
        //function loads xml file
        //loadXML(_xmlURL);
        return;
    }
    
    //Sets text from XML file
    public override function setTexts():void
    {
        var intro:String= myXML.s4_intro.text;
        mc.test_txt.htmlText = intro;
        return;
    }
        
    public var test_txt:TextField;
    
}

}

pageLoader.as

package pages
{
import flash.display.;
import flash.events.;
import flash.media.;
import flash.net.;
import flash.text.;
import flash.utils.;

public class pageLoader extends flash.display.MovieClip
{    
    
    public function pageLoader()
    {
        super();
        return;
    }
    
    //Function to load external page
    public function loadSWF(_swfURL):void
    {
        var pgLoader:Loader = new Loader();
        var pgRequest:URLRequest = new URLRequest(_swfURL);
        pgLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onCompleteHandler);
        pgLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgressHandler);
        pgLoader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
        pgLoader.load(pgRequest);
        return;            
    }
    
    //On Complete handler for page load
    public function onCompleteHandler(loadEvent:Event)
    {
        mc.addChild(loadEvent.currentTarget.content);
        addChild(mc);
        MovieClip(parent).removeChild(MovieClip(parent).preloader);
        return;
    }
    
    public function onProgressHandler(pgProgress:ProgressEvent)
    {
        var percent:Number = pgProgress.bytesLoaded/pgProgress.bytesTotal;
        
        percent = Math.round(percent * 100);
        trace(percent);
        //MovieClip(parent).txt.text = percent;
        MovieClip(parent).preloader.preloader_bar.width = (216.1/100)*percent;
        return;

    }
    
    function ioErrorHandler(event:IOErrorEvent):void {
        trace("ioErrorHandler: " + event);
    }
    
    //Function to load XML file
    public function loadXML(_xmlURL):void
    {
                    
        myXML = new XML();
        myXMLURL = new URLRequest(_xmlURL);
        myXLoader = new URLLoader(myXMLURL);
        myXLoader.addEventListener(Event.COMPLETE, completeHandler);
        myXLoader.addEventListener(IOErrorEvent.IO_ERROR, handleError);
        
        
        function completeHandler(event:Event):void {
            myXML = XML(event.target.data);
            dispatchEvent(event);
            //function to set texts from xml file -> function defined in indiviual page classes
            setTexts();
            return;
        }
        
        function handleError(event:IOErrorEvent):void {
            throw new Error("There was an IOerror accessing the XML file: " + event);
        }
        return;            
    }
    
    //Send XML data to individual page classes
    public function setTexts():void
    {
        return;
    }
    
    //Set up variables    
    public var mc:MovieClip = new MovieClip();
    public var _swfURL:String;
    public var _xmlURL:String;
    public var myXML:XML;
    public var myXLoader:URLLoader;
    public var myXMLURL:URLRequest;

}

}