DayZ Community Configuration Project E problem?

Each time i open DayZ, It gives this message: "Addon CA needs addon Community Configuration Project E" The game then loads fine but i cant join any servers, and considering 'community' is part of the error, i figured it has to be linked. I've search online and cannot find an answer to my problem. I have both Arma 2 & Arma 2 Operation Arrowhead installed. I've bought all games from steam and am running it on a Windows 7 Computer. Any ideas to fix this error? Thanks, Kieron.