Good day,

Was trying to update projects from beta 3 to v4.0.0 but kept receiving the following error when compiling some modules.

After isolating the affected file mixins/_hover.scss and going through it, seems to be the - character from iOS-an.. in top comments (line 6).
Replacing the - character with your own or setting @charset: 'UTF-8'; at the top of the file does the trick (you can also remove line 6 altogether as well).

Thank you!