I hate to say this but "entity does not exist" is usually my clue to the fact that the path does not exist.
Especially since you're moving to a machine other than the one you coded on, you will need to print-to-screen the full filepath that you are asking LoadSprite to use.
Especially since you're moving to a machine other than the one you coded on, you will need to print-to-screen the full filepath that you are asking LoadSprite to use.