Errors while installing JsBin locally

Question

C:\>npm install -g jsbin

I am getting following error while installing jsbin

> grunt build
>> Local Npm module "grunt-contrib-uglify" not found. Is it installed?
>> Local Npm module "grunt-contrib-jshint" not found. Is it installed?
>> Local Npm module "grunt-contrib-concat" not found. Is it installed?
Warning: Task "concat" not found. Use --force to continue.

Aborted due to warnings. npm ERR! code ELIFECYCLE npm ERR! errno 3 npm ERR! [email protected] postinstall: grunt build npm ERR! Exit status 3 npm ERR! npm ERR! Failed at the [email protected] postinstall script. npm ERR! This is probably not a problem with npm. There is likely additional log ging output above.

Note: I have installed the following packages

• "grunt-contrib-uglify"
• "grunt-contrib-jshint"
• "grunt-contrib-concat"