Type error Cant find solution

TypeError: Error #1088: The markup in the document following the root element must be well-formed. cant find where is a mistake...

stop();

var city:String;
var par_id:String;
var key:String;
var units:String;

var data_xml_url:String = "data.xml";
var user_data:XML = new XML();
var data_url:URLRequest = new URLRequest(data_xml_url);
var dataLoader:URLLoader = new URLLoader(data_url);

dataLoader.addEventListener(Event.COMPLETE, dataLoaded);

function dataLoaded(e:Event):void
{
user_data = XML(dataLoader.data);
city = user_data.city.toString();
par_id  = user_data.parid.toString();
key  = user_data.key.toString();
units  = user_data.units.toString();

}

icons_mc.visible = false;

var weather_xml_url:String = "http://ift.tt/1uDZTLD"+city+"?     cc=*&link=xoap&par="+par_id+"&key="+key+"&unit="+units;

var weather:XML = new XML();
var weather_url:URLRequest = new URLRequest(weather_xml_url);
var weatherLoader:URLLoader = new URLLoader(weather_url);

weatherLoader.addEventListener(Event.COMPLETE, weatherLoaded);

function weatherLoaded(e:Event):void
{
weather = XML(weatherLoader.data);
temp_txt.text = weather.cc.tmp;

icons_mc.visible = true;

var weather_icon:int = Number(weather.cc.icon.toString())+1;
icons_mc.gotoAndStop(weather_icon);

}

maybe this is wrong? user_data = XML(dataLoader.data);