What is wrong with that preloader?

I did a preloader and on put the codes on a movieclip
Here is the code

 
onClipEvent(enterFrame){
 _root.total = Math.round(_root.getBytesTotal/1024) + " kb";
 _root.loadet = Math.round(this.getBytesLoaded/1024) + " kb";
 _root.percent = Math.round(_root.getBytesLoaded / _root.getBytesTotal)*100 + "%";
 this._xscale = Math.round(_root.getBytesLoaded / _root.getBytesTotal)*50
} 

Why doesnt it work :h: