I'm having a problem with Script Hook V on the latest version of GTA V. The game loads up as it should, but whenever I get into a vehicle, I get an error message saying: "FATAL ERROR: Native Not Found". If any of you can help me resolve this problem, I will be very grateful. Thank you.
Menyoo tends to say that (if you're using it to spawn your car, of course). Menyoo is no longer updated, so no longer compatible with the latest update.
Maybe you can try just spawning the car, and set Menyoo to not auto-spawn yourself in it (and then enter manually).