Class Could Not Be Loaded

Hi -

Using MX Professoinal 2004:

Bit of a as newbie. My class file is in the directory of my residing .fla file, and refuses to load the class file. What I’m using for the SuperFades (Bob Donderwinkel - class:

import com.bdontwerp.SuperFades;
var my_SF:SuperFades=new SuperFades(loop_player, 30, true);
my_SF.alphaFade(5, 500);

Error: The class ‘com.bdontwerp.SuperFades’ could not be loaded.