Error 1046 URLLoader

[andrewsykes1170]

i have this code in my main program at the begining
and it produces the errors below but it works in isolation what can the problem be?

code

var myTextLoader:URLLoader = new URLLoader ();
myTextLoader.addEventListener(Event.COMPLETE, onLoaded);

function onLoaded(e:Event):void {
trace(e.target.data);
}

myTextLoader.load(new URLRequest("mytxt.txt"));

Errors

1046: Type was not found or was not a compile-time constant: URLLoader.
1180: Call to a possibly undefined method URLLoader.
1180: Call to a possibly undefined method URLRequest.
thnaks andrew

[5TonsOfFlax]

You need to import flash.net.URLLoader and flash.net.URLRequest