are you using any modded rez files? If you are you are probably getting the error about a game client file is corrupted. Mods have been patched, I ran into the same problem and found out it was my rez mods. Try reinstalling the game and launch the game without running any cleaners or changing any of the files in your CA folder and see if that helps. If you still have problems try to give some more information about the problem like error messages, how you start the game, etc