Error #1120 - Access of Undefined Property?

I just started to learn how to write classes, or external AS files. I have a few movies and they are receiving the same error: #1120 Access of Undefined Property. I’ve checked Curtis Morley, but I don’t think the problem is the instance names. Since I’m adding the the movieclips with the codes. Both movies’ errors occur where it contains “e.bytesLoaded / e.bytesTotal;” Does any know what’s happening? I’m confused…

package com {
    
    import flash.net.URLRequest;
    import flash.events.Event;
    import flash.events.ProgressEvent;
    import flash.display.Loader;
    import flash.display.MovieClip;
    import flash.text.*;

    public class PreloaderIndex extends MovieClip {
        
        public var l:Loader = new Loader();
        public var perc:Number = e.bytesLoaded / e.bytesTotal;
        
        public function PreloaderIndex (event:Event):void {
            
            l.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, loop);
            l.contentLoaderInfo.addEventListener(Event.COMPLETE, done);
            l.load(new URLRequest("index02.swf"));
            
        }
        
        public function loop(event:ProgressEvent):void {
            
            percent.text = Math.ceil(perc*100).toString();

        }
        
        public function done(event:Event):void {
    
            removeChildAt(0);
            percent = null;
            addChild(l);
        
        }
        
    }

}
package com {
    
    import fl.transitions.Tween;
    import fl.transitions.easing.*;
    import flash.display.Loader;
    import flash.display.MovieClip;
    import flash.net.*;
    import flash.events.*;
    import flash.text.*;
    
    public class Content extends MovieClip {
        
        public var xmlPath:String = "menu.xml";
        public var settingsXML:XML;
        public var tweensArray:Array = new Array();
        public var buttonTween:Tween;
        
        public var loader = new URLLoader();
        
        public function Content(){
            
            loader.load (new URLRequest(xmlPath));
            loader.addEventListener (Event.COMPLETE, xmlLoaded);
            
        }
        
        public function xmlLoaded (e:Event):void {
            
            if ((e.target as URLLoader) != null ) {
                    settingsXML = new XML(loader.data);
                    settingsXML.ignoreWhitespace = true;
                    createMenu ();
                }
            
        }
        
        public var menuItem:MenuItem;
        public var i:uint = 0;
        public var orgAlpha:Number = 0.5;
        public var newAlpha:Number = 1;
        
        public function createMenu ():void {
            
            for each (var link:XML in settingsXML..link) {
                menuItem = new MenuItem();
                menuItem.id = i;
                menuItem.menuLabel.text = link.@name;
                menuItem.menuLabel.autoSize = TextFieldAutoSize.LEFT;
                menuItem.x = 0;
                menuItem.y = 0 + i*30;
                menuItem.alpha = 0.5;
                menuItem.buttonMode = true;
                menuItem.mouseChildren = false;
                menuItem.addEventListener (MouseEvent.MOUSE_OVER, mouseOverHandler);
                menuItem.addEventListener (MouseEvent.MOUSE_OUT, mouseOutHandler);
                menuItem.addEventListener (MouseEvent.CLICK, mouseClickHandler);
                addChild (menuItem);
                i++;
                }
        
        }
        
        public var targetID:int;
        public var pathToSWF:String;
        public var swfloader:Loader = new Loader();
        
        public function swfLoader ():void {
            swfloader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgress);
            swfloader.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);
            swfloader.x = 200;
            }
            
        public var request:URLRequest = new URLRequest(pathToSWF);    
            
        public function mouseClickHandler(e:MouseEvent):void {
            targetID = e.currentTarget.id;
            pathToSWF = String(settingsXML..link[targetID].@swfurl);
            swfloader.load(request);
            }

        public var p:Number = (e.bytesLoaded / e.bytesTotal) * 100;

        public function onProgress(e:ProgressEvent):void {
            trace(p);
            }

        public function onComplete(e:Event):void {
            addChild(swfloader);
            }
    
        public function mouseOverHandler (e:Event):void {
            buttonTween = new Tween(e.target, "alpha", Regular.easeOut, orgAlpha, newAlpha, 0.25, true);
            }
    
        public function mouseOutHandler (e:Event):void {
            buttonTween = new Tween(e.target, "alpha", Regular.easeOut, newAlpha, orgAlpha, 0.25, true);
            }
        
    }
    
}