title: Can't get Gulp to run: cannot find module 'gulp-util'
body: <p>On Windows 7, I've installed gulp as explained here: <a href="http://markgoodyear.com/2014/01/getting-started-with-gulp/" rel="noreferrer">http://markgoodyear.com/2014/01/getting-started-with-gulp/</a>:</p>
  
  <ul>
  <li><code>npm install gulp -g</code></li>
  <li>In my app folder: <code>npm install gulp --save-dev</code></li>
  <li>I create a <code>gulpfile.js</code> file.</li>
  </ul>
  
  <p>But then, when I try to run <code>gulp</code>, I get this error message:</p>
  
  <pre><code>module.js:340
  throw err;
        ^
  Error: cannot file module 'gulp-util'
  at Function.Module._resolveFilename (module.js:338:15)
  </code></pre>
  
  <p>etc.</p>
  
  <p>But <code>gulp-util</code> is present (in the local app folder) in:</p>
  
  <pre><code>node_modules
      gulp
          node_modules
              gulp-util
  </code></pre>
  
  <p>Any idea what may be the cause?</p>