Zlib error

Having set up a server for myself and a mate, I tried to add a 458 Italia mod, I set up the mods folder correctly and added the car (carbonizzarre.ytf, carbonizzare.ytd, carbonizzare_hi.ytf, carbonizzare+hi.ytd) in the stream folder, when i spawn a carbonizzare in game, it comes up with a zlib error.
How do i make it so i can have the replacement cars on the server?
and how do I make it so the cars are add ons not replacements?
there are no other files in the stream folder, so is anything needed in there?#

*Edit, tried with a McLaren 675LT Spider mod, same error, so it isn’t the car

4k models aren’t supported.