I have only recently had this error while playing arma 3. I decided to join an new arma 3 exile server with some mods that I hadn't used previously. I downloaded them and managed to play the server just fine. But when I came to play it the next day my game crashed and when I tried to rejoin I would be able to load into the server but then it would crash because it would load completely. I would get the same error everytime. So I did a fresh install and it worked for about an hour and a half joining this same server. Then my game crashed once again then the same error repeated. I have been able to join other servers with similar but not all mods just fine.