Can't compress scss file with Compass (ffi-1.11.3 problem) Mac OSX Big Sur

I their! First i'm very sory for my bad english is not my first language.

So I try to compress scss file on save with Dreamwaver with Compass enabled on my Mac with OSX Big Sur. I won't work. If i uncheck Compass it work, but i really really wony Compass ;-)... I have got this error message "Ignoring ffi-1.11.3 because it's extensions are not built. Try: gem pristine ffi --version 1.11.3". I had a hard time to find how to do that but i manage to find how, so i did, but... didn't work... i surch google, find some others way to the same thing but, I'm realy not sure i did the good things (cause it's very complicated and like I said english is not my firs language) please!! help!! 🙂

Thank you so mush