Keep getting kicked from server can't figure out solution please help

  • Trying to join [CCG] Frankie's Tanoa US server keep getting this error message.

    Files "addons ss_ac_2.pbo" are not signed by a key accpeted by this server. To play on this server, remove listed files or install additional accepted keys.

    I have tried reinstalling both Arma and the A3 launcher, had no effect. Verified steam files, and also the mods individually. Also tried the CCG launcher, but received the same error.

    Could use any help I can get thanks.