title: How to debug sencha application
body: <p>I am very new to using sencha. I have simple application and I want to add debug js library to see errors and warning. Problem is when I add this js to my app I see just blank screen and errors in this library. My index.html look like:</p>
  
  <pre><code>&lt;!doctype html&gt;
  &lt;html&gt;
  &lt;head&gt;
  &lt;meta charset="utf-8"&gt;
  &lt;title&gt;Account Manager&lt;/title&gt;
  &lt;script
      src="http://cdn.sencha.com/ext/gpl/4.2.0/examples/shared/include-ext.js"&gt;&lt;/script&gt;
  &lt;script
      src="http://cdn.sencha.com/ext/gpl/4.2.0/examples/shared/options-toolbar.js"&gt;&lt;/script&gt;
  &lt;script src="../../api-debug.js"&gt;&lt;/script&gt;
  &lt;script src="app.js"&gt;&lt;/script&gt;
  &lt;script src="ext-all-debug.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;&lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>when I remove ext-all-debug.js everything works.</p>
  
  <p>So what I am doing wrong ?</p>