Of course I'm not apart of the S-4 Mod team, however, as an instructor, the first thing, and best thing to do is delete and then reinstall CBA. Generally that fixes the problem for most privates. However sometimes that doesn't work. Lastly when launching through the arma 3 launcher under the Mods Tab, make sure that no Steam CBA is loaded on your launcher as it sometimes likes to use the most updated or steam version of CBA although you selected the 506th version of CBA.
Hopefully this helps, that's if you haven't done/tried any of the options I've stated.