Vehicle Addon

I honestly have no clue whats wrong, i took a monster cuda as a test, and made it in to a add on format(i think), i went in single player, spawned it, and it showed up invisible, so i replaced the model with a working mustang model on my server, its still invisible, can someone tell me where i went wrong? i tried everything, from downloading a few packs, replacing the models, adding textures, etc, but nothing is working


No, this is not a addon for its just something for my server


Bump, Common, i really need help