Using a preloader in a separate AS file?

Hey folks,

I've appropriated a preloader I created previous where it existed on the main timeline. For my new project, I placed it in an external AS file, but something's off. I keep getting this error message, referencing line 16 in my line of code:

"1046: Type was not found or was not a compile-time constant: Event."

The code is below:

package {
    import flash.display.MovieClip;
    import flash.events.Event.ENTER_FRAME;
    import flash.events.MouseEvent;
    import MainNav;
    import Gallery;
    import MP3Player;

    public class ZDSite extends MovieClip{
        stop();
        private var total:Number = stage.loaderInfo.bytesTotal;
        private var loaded:Number = stage.loaderInfo.bytesLoaded;
       
        addEventListener(Event.ENTER_FRAME, loading);
       
        private function loading(event:Event):void {
            //add in load bar here later: Bar_mc.scaleX = loaded/total;
            //add in load text box here late: txtLoaded.text = Math.floor((loaded/total)*100)+ "%";
            //add more load stuff here later
            if (total == loaded) {
                play();
                removeEventListener(Event.ENTER_FRAME, loading);
                //add in function to check if current frame = 60 and stop there
                //add in MainNav, Gallery, and MP3Player to bring objects to stage here
            }
        }
    }
    public class MainNav extends MovieClip {
        //insert Main Nav Stuff here
    }
    public class Gallery extends MovieClip {
        //insert Gallery stuff here
    }
    public class MP3PLayer extends MovieClip {
        //insert MP3 Player stuff here
    }
}

Any insight would be appreciated. Thanks!