I've only gotten it once in multiplayer, but I know for sure it was caused by a car mod that I had. But the car that I had did not replace any vanilla cars. I added it in. The strange thing is, when I added this car I couldn't use the computers in single player, and I got this error in multiplayer. I used to have modded cars and played fine in multiplayer..so what gives?
I have the Steam version by the way.