title: ReferenceError: goog is not defined
body: <p>I am new on XTK with its things. 
  I am following the X:DevelopersHeadsUp to try to run the demo html.</p>
  
  <p>1) I clone the repository and run ./deps.py . Now the xtk-deps.js generated .
  2) I invoke the html as given in the guide.</p>
  
  <hr>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;
  &lt;title&gt;XTK TEST WITHOUT COMPILATION&lt;/title&gt;
  
  &lt;script type="text/javascript" src="../X/lib/closure-library/closure/goog/base.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="../X/xtk-deps.js"&gt;&lt;/script&gt;
  
  &lt;script type="text/javascript"&gt;
  
    // include all used X-classes here
    // this is only required when using the xtk-deps.js file
    goog.require('X.renderer3D');
    goog.require('X.cube');
  
    var run = function() {
  
      var r = new X.renderer3D();
      r.container = 'r';
      r.init();
  
      var cube = new X.cube();
  
      r.add(cube);
  
      r.render();
  
    };
  &lt;/script&gt;
  
  &lt;body onload="run()"&gt;
  
  
    &lt;div id="r" style="background-color: #000000; width: 100%; height: 100%;"&gt;&lt;/div&gt;
  
  &lt;/body&gt;
  </code></pre>
  
  <hr>
  
  <p>but failed with the error message ReferenceError: goog is not defined</p>
  
  <p>Any thing wrong? 
  thanks in advance .</p>
  
  <p>MaiZi</p>