I get this error when installed globally or locally latest version (1.1.1), so installed local versions and was able to get working 1.0.6 version.
\node_modules\color\index.js:34
throw new Error('Unable to parse color from string "' + obj + '"');
Error: Unable to parse color from string "darken($color, 10%)"
I think this caused by node_modules/nucleus-styleguide/test.scss
Windows 10
node: 6.11.3
npm: 3.8.0
p.s. not sure if it is related, "npm view color version" returns 2.0.0