card-react failed to build with node 6.11.x

[kktam]

latest version of card-react failed to build with node 6 or higher.

npm run start

> card-react@1.2.5 start /Users/n/Documents/Work/react/card-react
> grunt dev

Running "clean:build" (clean) task
>> 1 path cleaned.

Running "clean:lib" (clean) task
>> 1 path cleaned.

Running "cjsx:build" (cjsx) task
File lib/card-react-form-container.js created.
File lib/card-react-component.js created.

Running "browserify:dev" (browserify) task
>> Bundle .tmp/example/card-loader.js created.

Running "sass:dist" (sass) task
Warning: 
You need to have Ruby and Sass installed and in your PATH for this task to work.
More info: https://github.com/gruntjs/grunt-contrib-sass
 Use --force to continue.

Aborted due to warnings.

npm ERR! Darwin 16.4.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "run" "start"
npm ERR! node v6.11.1
npm ERR! npm  v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! card-react@1.2.5 start: `grunt dev`
npm ERR! Exit status 6
npm ERR! 
npm ERR! Failed at the card-react@1.2.5 start script 'grunt dev'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the card-react package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     grunt dev
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs card-react
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls card-react
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/n/Documents/Work/react/card-react/npm-debug.log

versions:

$npm -v
3.10.10
$ node -v
v6.11.1

compiled in Mac with OSX Sierra