@liondreamer27 Wow, that's a lot of mods. In that case, I'd still generate a clean folder, just to establish that the game is functioning properly. Then I think it would still be best to download MCCC again, since it originally generated the error message you saw. Test it out in-game to make sure the new version is fine, and then you can move the rest of your mods into the new folder in batches and test them out. Any batch that works (i.e. showing up in-game and no errors thrown) can be moved somewhere else for safekeeping while you test the others. (While this is going on, either back up your saves or keep them somewhere else so that you don't risk corrupting them by accident.)
I've heard that some mods have separate versions for mac and PC, although I don't know of any specific examples. But it would be a good idea to check some of your sources to make sure the mods you already have aren't mac-only. That could also cause error messages, or worse.