Keep getting this critical error

[FastaBenj]

In game all of a sudden i wont be able to move (tho i can still shoot) and after a few seconds the game crashes with a critical error, can anyone help cos i've just rented a server for this game and at the mo i can't play on it.
Attached is my log file from most recent crash

[Xienen]

Have you tried reinstalling the game? It looks as though some files may be corrupted. You should probably hard delete the files to reinstall. Delete all files/folders out of /Program Files/Steam/steamapps/common/killingfloor/ and let Steam redownload everything.