Can not hear songs from my microsd card - help

Ok you plug the card into a reader on your computer, and added the music then pluged it into your player and it gave you an error message? Try taking the card out and putting it back in perhaps it didint load right and the fuzecould not build the library file. If this does not help, plug the card into the computer and then delete everything off of it, then plug it back into the fuze and add the music onto the card with it plugged into the player