Findouse

So i just got dayz and want to start playing but cant, this is whats going on. So i try to join a server, a Dayz Epoch sever and it loads but then it says this: You can not play/edit this mission; it depends on downloadable content that has been deleted; then it states all of the things that are missing. I dont know what to do. I tried joining other severs that arent epoch and they dont work. thanks for your help!.