Problem with running grunt watch

grunt-watch-reference.sh

$ grunt watch
>> Local Npm module "grunt-contrib-watch" not found. Is it installed?
>> Local Npm module "grunt-contrib-compass" not found. Is it installed?
Warning: Task "watch" not found. Use --force to continue.


/*global module:false*/
module.exports = function(grunt) {

  // Project configuration.
  grunt.initConfig({
    // Task configuration.
    compass: {
      options: {
        config: 'config.rb',
        force: true
      }
    },
    watch: {
      files: ['prada/src/main/webapp/css/sumo/**/*.scss'],
      tasks: ['compass']
    }
  });

  // These plugins provide necessary tasks.
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-contrib-compass');

  // Default task.
  grunt.registerTask('default', ['watch']);

};

npm list                                                               [11:57:17]
npm WARN package.json [email protected] No repository field.
npm WARN package.json [email protected] 'repositories' (plural) Not supported.
npm WARN package.json Please pick one as the 'repository' field
npm WARN package.json [email protected] No repository field.
npm WARN package.json [email protected] 'repositories' (plural) Not supported.
npm WARN package.json Please pick one as the 'repository' field
/Users/blazar/Development/sumo
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