error: Functions can only contain variable declarations and control directives

Hello,
The tutorial was going great until I ran into a problem in chapter 03_03.
I can successfully start the server by issuing the gulp command but if any changes are made to any scss files the following error shows in the Mac OS X terminal.

{ [Error: error components/sass/style.scss (Line 12 of /Library/Ruby/Gems/2.0.0/gems/susy-2.2.12/sass/susy/language/susy/_validation.scss: Functions can only contain variable declarations and control directives.)
Compilation failed in 1 files.
]
message: '\u001b[31m error\u001b[0m components/sass/style.scss (Line 12 of /Library/Ruby/Gems/2.0.0/gems/susy-2.2.12/sass/susy/language/susy/_validation.scss: Functions can only contain variable declarations and control directives.)\n\u001b[31mCompilation failed in 1 files.\n\u001b[0m',
fileName: '/Users/gilbertstankiewicz/Desktop/responsive/components/sass/style.scss',
showStack: false,
showProperties: true,
plugin: 'gulp-compass',
__safety: { toString: [Function: bound ] } }

The web page shows the following:

Line 14 in the style.scss file is "@import "susy";

Any idea what is going on here?