Error 5001: The name of package "com.x.y" does not reflect the location of this file

took me 2 hours to debug !!

finally reason is you must set your document class same as your package

e.g class = y.as
package com.x{
public class y{
public function y(){
}
}
}

when you run from Flash CS3 Make sure your document class is com.x.y where y = class name