title: gruntfile.js [TypeError: undefined is not a function]
body: <p>after typing in the terminal na "grunt" and i got an error</p>
  
  <pre><code>Loading "Gruntfile.js" tasks...ERROR
  &gt;&gt; TypeError: undefined is not a function
  Warning: Task "default" not found. Use --force to continue.
  
  Aborted due to warnings.
  </code></pre>
  
  <p>here my Gruntfile <a href="https://gist.github.com/ericsonluciano/1d9b4f267203271d5793" rel="nofollow">Gruntfile.js Gist</a></p>
  
  <p>and my package.json</p>
  
  <pre><code>{
    "name": "mintsflow",
    "version": "0.0.0",
    "title": "Mintsflow - Front End Worflow",
    "author": "Ericson Luciano",
    "website": "http://ericsonluciano.me",
    "url": "http://mintsflow.ericsonluciano.me",
    "description": "A personal and easy to use front end workflow using sass and grunt.js ",
    "repository": {
      "type": "git",
      "url": "http://github.com/ericsonluciano/mintsflow.git"
    },
    "license": "MIT",
    "devDependencies": {
      "bower": "~1.3.3",
      "grunt": "~0.4.4",
      "grunt-contrib-sass": "~0.7.3",
      "grunt-contrib-concat": "~0.4.0",
      "grunt-contrib-imagemin": "~0.7.0",
      "grunt-contrib-connect": "~0.7.1",
      "grunt-contrib-uglify": "~0.4.0",
      "grunt-contrib-watch": "~0.6.1",
      "grunt-contrib-clean": "~0.5.0",
      "grunt-contrib-jshint": "~0.10.0",
      "grunt-autoprefixer": "~0.7.3",
      "grunt-open": "~0.2.3",
      "grunt-notify": "~0.3.0",
      "matchdep": "~0.3.0",
      "grunt-contrib-cssmin": "~0.9.0",
      "grunt-bower": "~0.13.1",
      "connect-livereload": "~0.4.0",
      "imagemin-mozjpeg": "~0.1.2"
    },
    "dependencies": {}
  }
  </code></pre>
  
  <p>node -v "v0.10.26"
  npm -v "1.4.3"
  grunt --version "grunt-cli v0.1.13 grunt v0.4.4"</p>
  
  <p>Let me know what wrong with my code. Thank you and have a great day.</p>