I honestly don't get why the heck it is happening. For me absolutely everything in this meta file looks great. Can you see what's wrong?
In this vehicles.meta there's 2 vehicles: policet and police.
If I only use one of them it works just fine, however when I add more than 1 it crashes. No matter what vehicle. How come?
Here's a link to a pastebin with the code (easier to look over with pastebin I believe): http://pastebin.com/sNj1UYav