AS3: Sound Class stream error (2032)

I am trying to play a sound clip which is on the root of my .fla called "MyWord.mp3"

I have the URL inside of an XML file which I've loaded

Here is the code which accesses and plays on click of the soundbtn

var soundBtn:soundbtn = new soundbtn();

    soundBtn.height = 22;
    soundBtn.scaleX = soundBtn.scaleY;

    soundBtn.addEventListener(MouseEvent.CLICK, PlayAu);

    function PlayAu(event:MouseEvent):void{

        var SoundChnl:SoundChannel = new SoundChannel();

        var SoundFile:Sound = new Sound();

        SoundFile.load(new URLRequest(AudioLO));

        SoundFile.addEventListener(Event.COMPLETE, onComplete,false,0,true);

        function onComplete(e:Event):void{

            SoundChnl = SoundFile.play();

        }

    }
addChild(soundBtn);

However I get an error on my "var SoundFile:Sound = new Sound();" line saying

Error #2044: Unhandled IOErrorEvent:. text=Error #2032: Stream Error.

For reference here is the xml file line entry

<wordgroup>
    <englishword>Mother</englishword>
    <languageword>Wee-Ung</languageword>
    <pronouciation>Wee - Young</pronouciation>
    <audio>"MyWord.mp3"</audio>
</wordgroup>