Hello Guys I had the same problem as i tryed to run DayZ mod yesterday for the first time, now heres what to do If you have ArmA2 + Operation Arrowhead as addon. First get the latest patch for ARMA2, install and then get the latest Operation Arrowhead patch, install it aswell, its that simple, the problem with CA_BAF occures if you use DAYZ Commander to update your Arma2 or OA version! Somehow DAYZ Commander showed my version of the game as up to date (1.62) but it wasnt, as i manually tryed to install 1.62 for OA it said "please install patch 1.52 before installing 1.62, so somehow i had OA in version 1.52 and NOT as DAYZ Commander said 1.62. Good luck guys hope it works for you too... If you have any question PM me!!! Greetz Psychonaut