Xml ioerrors

Question

I am new to loading xml...obviously!
Anyway, I have  buttons that relate to 4 different videos.  I want to click a button and show that video, click another button which should stop the first and play the target.  I put this code together from 2 different tutorials from the classroom in a book, and not quite sure what to change. Its not loading the xml...I think there are 2 conflicting functions  chooseVid and changeVid
my buttons aren't working and I don't see any text on them.
getting this error as well
Error: Error #2078: The name property of a Timeline-placed object cannot be modified.
    at flash.display::DisplayObject/set name()
    at flash.display::Sprite/constructChildren()
    at flash.display::Sprite()
    at flash.display::MovieClip()
    at flash.display::MovieClip/gotoAndStop()
    at main2_fla::mcdropdowns2_9/video()
What a mess!  Any Ideas?
var currVid:String;
var vidList_XML:XML;
var vidTitle:String;
var count:int = 0;
var vidNum:int = 0;
var xmlReq:URLRequest = new URLRequest("../vidlist.xml");
var xmlLoader:URLLoader = new URLLoader();
xmlLoader.load(xmlReq);
xmlLoader.addEventListener(Event.COMPLETE, xmlLoaded);
xmlLoader.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
function errorHandler(event:IOErrorEvent):void {
           title_txt.text = "XML loading error: " + event;
function xmlLoaded(event:Event):void  {
    vidList_XML = new XML(xmlLoader.data);
    //vidPlayer.source = "media/SK_RAINN.f4v";
    vid1.addEventListener(MouseEvent.CLICK, chooseVid);
    vid2.addEventListener(MouseEvent.CLICK, chooseVid);
    vid3.addEventListener(MouseEvent.CLICK, chooseVid);
    vid4.addEventListener(MouseEvent.CLICK, chooseVid);
    //function to set vids is called after XML loading is complete
    setVids();
function setVids():void {
    for(var i = 0; i < 3; i++) {
        var title_txt:String = vidList_XML.vid[i + 1].name;
        var clipTitle = this["vid" + (i + 1)].name;
        clipTitle.text = title_txt;
        clipTitle = String;
function changeVid(e:VideoEvent):void  {
    var nextVid:String = "media/" + vidList_XML[count].file;
    vidPlayer.source = nextVid;
    vidTitle = vidList_XML[count].name;
    title_txt.text = vidTitle;
    count++;
function chooseVid(e:MouseEvent):void {
    switch (e.currentTarget.name) {
        case "vid1":
        //sets the currVid based on the XML file
        // the songNum variable is based on which button was selected
            vidNum = 0;
            //the songCount variable makes it possible to have more songs in the XML file than buttons on the interface. songCount is incremented when the user clicks the moreSongs button onstage.
            currVid = vidList_XML.vid[vidNum + count].file;
            break;
        case "vid2":
            vidNum = 1;
            currVid = vidList_XML.vid[vidNum + count].file;
            break;
        case "vid3":
            vidNum = 2;
            currVid = vidList_XML.vid[vidNum + count].file;
            break;
        case "vid4":
            vidNum = 3;
            currVid = vidList_XML.vid[vidNum + count].file;
            break;
var format:TextFormat = new TextFormat();
format.font ="Arial Black";
format.color = 0x333333;
format.size = 14;
title_txt.defaultTextFormat = format;  

Answer 1

you have something on-stage whose name you're trying to reassign.
click file/publish settings/flash and tick "permit debugging".   the line number of the offending code will be in the error message.