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 dateformat@1.0.2-1.2.3 No repository field.
npm WARN package.json eventemitter2@0.4.11 'repositories' (plural) Not supported.
npm WARN package.json Please pick one as the 'repository' field
npm WARN package.json jshint@2.0.1 No repository field.
npm WARN package.json faye-websocket@0.4.4 'repositories' (plural) Not supported.
npm WARN package.json Please pick one as the 'repository' field
/Users/blazar/Development/sumo
├─┬ grunt@0.4.1
│ ├── async@0.1.22
│ ├── coffee-script@1.3.3
│ ├── colors@0.6.0-1
│ ├── dateformat@1.0.2-1.2.3
│ ├── eventemitter2@0.4.11
│ ├─┬ findup-sync@0.1.2
│ │ └── lodash@1.0.1
│ ├─┬ glob@3.1.21
│ │ ├── graceful-fs@1.2.1
│ │ └── inherits@1.0.0
│ ├── hooker@0.2.3
│ ├── iconv-lite@0.2.10
│ ├─┬ js-yaml@2.0.5
│ │ ├─┬ argparse@0.1.15
│ │ │ ├── underscore@1.4.4
│ │ │ └── underscore.string@2.3.1
│ │ └── esprima@1.0.3
│ ├── lodash@0.9.2
│ ├─┬ minimatch@0.2.12
│ │ ├── lru-cache@2.3.0
│ │ └── sigmund@1.0.0
│ ├─┬ nopt@1.0.10
│ │ └── abbrev@1.0.4
│ ├─┬ rimraf@2.0.3
│ │ └── graceful-fs@1.1.14
│ ├── underscore.string@2.2.0rc
│ └── which@1.0.5
├─┬ grunt-contrib-compass@0.2.0
│ ├─┬ grunt-lib-contrib@0.5.3
│ │ └── zlib-browserify@0.0.1
│ └── tmp@0.0.16
├─┬ grunt-contrib-jshint@0.5.4
│ └─┬ jshint@2.0.1
│   ├─┬ cli@0.4.4-2
│   │ └─┬ glob@3.2.1
│   │   ├── graceful-fs@1.2.1
│   │   └── inherits@1.0.0
│   ├── console-browserify@0.1.6
│   ├─┬ minimatch@0.2.12
│   │ ├── lru-cache@2.3.0
│   │ └── sigmund@1.0.0
│   ├── shelljs@0.1.4
│   └── underscore@1.4.4
├─┬ grunt-contrib-nodeunit@0.2.0
│ └─┬ nodeunit@0.8.0
│   └─┬ tap@0.4.3
│     ├── buffer-equal@0.0.0
│     ├── deep-equal@0.0.0
│     ├─┬ difflet@0.2.5
│     │ ├── charm@0.0.8
│     │ ├── deep-is@0.1.2
│     │ └── traverse@0.6.3
│     ├─┬ glob@3.2.1
│     │ ├── graceful-fs@1.2.1
│     │ ├── inherits@1.0.0
│     │ └─┬ minimatch@0.2.12
│     │   ├── lru-cache@2.3.0
│     │   └── sigmund@1.0.0
│     ├── inherits@2.0.0
│     ├── mkdirp@0.3.5
│     ├─┬ nopt@2.1.1
│     │ └── abbrev@1.0.4
│     ├─┬ runforcover@0.0.2
│     │ └─┬ bunker@0.1.2
│     │   └─┬ burrito@0.2.12
│     │     ├── traverse@0.5.2
│     │     └── uglify-js@1.1.1
│     ├── slide@1.1.4
│     └── yamlish@0.0.5
└─┬ grunt-contrib-watch@0.4.4
  ├─┬ gaze@0.3.4
  │ ├─┬ fileset@0.1.5
  │ │ └─┬ glob@3.2.1
  │ │   ├── graceful-fs@1.2.1
  │ │   └── inherits@1.0.0
  │ └─┬ minimatch@0.2.12
  │   ├── lru-cache@2.3.0
  │   └── sigmund@1.0.0
  └─┬ tiny-lr@0.0.4
    ├── debug@0.7.2
    ├── faye-websocket@0.4.4
    ├─┬ noptify@0.0.3
    │ └─┬ nopt@2.0.0
    │   └── abbrev@1.0.4
    └── qs@0.5.6