AS3 with error

stop();

var users:Array;
var userXmlLoader:URLLoader = new URLLoader();
var userXML:XML;
var usercount:int;

//XML

userXmlLoader.addEventListener(Event.COMPLETE, LoadXML);
userXmlLoader.load(new URLRequest("bin/users.xml"));

function LoadXML(e:Event):void
{
    userXML = new XML(e.target.data);

    ParseUsers();
}

function ParseUsers():void
{
    var usernames = userXML.user.username;
    usercount = usernames.length();

    user1.username_txt.embedFonts = false;
    user2.username_txt.embedFonts = false;
    user3.username_txt.embedFonts = false;
    user4.username_txt.embedFonts = false;
    user5.username_txt.embedFonts = false;
    user6.username_txt.embedFonts = false;

    if (usercount == 1)
    {
        user1.username_txt.text = usernames[1];
        user2.visible = false;
        user3.visible = false;
        user4.visible = false;
        user5.visible = false;
        user6.visible = false;
    }
    else if (usercount == 2)
    {
        user1.username_txt.text = usernames[1];
        user2.username_txt.text = usernames[2];
        user3.visible = false;
        user4.visible = false;
        user5.visible = false;
        user6.visible = false;
    }
    else if (usercount == 3)
    {
        user1.username_txt.text = usernames[1];
        user2.username_txt.text = usernames[2];
        user3.username_txt.text = usernames[3];
        user4.visible = false;
        user5.visible = false;
        user6.visible = false;
    }
    else if (usercount == 4)
    {
        user1.username_txt.text = usernames[1];
        user2.username_txt.text = usernames[2];
        user3.username_txt.text = usernames[3];
        user4.username_txt.text = usernames[4];
        user5.visible = false;
        user6.visible = false;
    }
    else if (usercount == 5)
    {
        user1.username_txt.text = usernames[1];
        user2.username_txt.text = usernames[2];
        user3.username_txt.text = usernames[3];
        user4.username_txt.text = usernames[4];
        user5.username_txt.text = usernames[5];
        user6.visible = false;
    }
    else if (usercount == 6)
    {
        user1.username_txt.text = usernames[1];
        user2.username_txt.text = usernames[2];
        user3.username_txt.text = usernames[3];
        user4.username_txt.text = usernames[4];
        user5.username_txt.text = usernames[5];
        user6.username_txt.text = usernames[6];
    }
    else
    {
        trace("Something went wrong when getting user count!");
    }

    for each (var u:XML in usernames)
    {

    }
}