title: grunt - getting "Local Npm module "xxx" not found. Is it installed?" What's causing this?
body: <p>I just received a copy of a grunt package to work on, but I'm new to grunt and am having trouble finding answers to a few things.  The biggest issue is not knowing where the errors below are coming from - can someone tell me where this is coming from?  Both of these files are in the same directory.</p>
  
  <pre><code>$ grunt
  &gt;&gt; Local Npm module "grunt-contrib-clean" not found. Is it installed?
  &gt;&gt; Local Npm module "grunt-contrib-concat" not found. Is it installed?
  &gt;&gt; Local Npm module "grunt-contrib-copy" not found. Is it installed?
  &gt;&gt; Local Npm module "grunt-contrib-cssmin" not found. Is it installed?
  &gt;&gt; Local Npm module "grunt-contrib-handlebars" not found. Is it installed?
  &gt;&gt; Local Npm module "grunt-contrib-jshint" not found. Is it installed?
  &gt;&gt; Local Npm module "grunt-contrib-qunit" not found. Is it installed?
  &gt;&gt; Local Npm module "grunt-contrib-uglify" not found. Is it installed?
  &gt;&gt; Local Npm module "grunt-preprocess" not found. Is it installed?
  &gt;&gt; Local Npm module "grunt-wrap" not found. Is it installed?
  &gt;&gt; Local Npm module "grunt-debug-task" not found. Is it installed?
  Warning: Task "clean" not found.  Use --force to continue.
  
  Aborted due to warning.
  
  $
  </code></pre>
  
  <p>And here is my package.json:</p>
  
  <pre><code>{
    "name": "baked-widget",
      "srcDirectory": "./src",
      "srcJavascript": "./src/js",
      "srcCss": "./src/css",
      "srcData": "./src/data",
      "testDirectory": "./test",
      "tgtDirectory": "./build",
      "installDirectory": "../com/public/widgets",
    "version": "4.2.0",
    "devDependencies": {
      "grunt": "~0.4",
      "grunt-contrib-clean": "~0.4.0",
      "grunt-contrib-concat": "~0.3.0",
      "grunt-contrib-copy": "~0.5.0",
      "grunt-contrib-cssmin": "~0.9.0",
      "grunt-contrib-handlebars": "~0.6",
      "grunt-contrib-jshint": "~0.8",
      "grunt-contrib-uglify": "~0.3",
      "grunt-contrib-qunit": "~0.4",
      "grunt-contrib-watch": "~0.5",
      "grunt-preprocess": "~4.0",
      "grunt-wrap": "~0.3",
      "grunt-debug-task": "~0.1.4"
    }
  }
  </code></pre>