Problems with code.

I tried a code to call the class in the principal main to the bullet work, but... don't worked, i read and re-read and for me there's nothing wrong, PLEASE HELP ME.

Link of my game: https://microstudio.io/rianstar/ghosthunt/

thanks for the help

error >>

ghostINIT = function()
//.....
  ghost.height = 8
//.....

Shot = class
  constructor = function( source )