Readium js viewer Chrome packaged app build

Currently i am working on creating chrome App for epub3 reader. I am not able to package the JS Viewer as Chrome App, i am facing some issues

I am using Windows 7 and follwoing the steps mentioned on site.

To run the chrome packaged app, you will need to do the following:

install Node.JS (details depend on your operating system) install the Grunt build tool: npm install -g grunt-cli install the project's dependencies: npm install Build the application grunt chromeApp Load the app as an unpacked extension from (project-root)/build/chrome-app. Directions here Open the App in Chrome.

In cmd mode after typing "grunt chromeApp" i am not able to proceed and getting this error: Running "versioning" task Fatel Error: Cannot read property 'commit' of undefined. see the attached screen shot.!

https://www.dropbox.com/s/s0drjzph23r17sb/error.jpg?dl=0