[Konstantinos]

That's not a server crash but a client one. The problem is that there are not any player class (refer to AddPlayerClass) so when you spawn, the bug about the boundries is occured and it sometimes crashes the client of the player too. The solution for this is to use atleast a player class (in other words - add skins).

About the missing file, honestly I don't know but don't just ****** the file and download. There was a thread which was saying why you shouldn't download random .dll files from the internet, so try avoiding that.