title: Android Error When Calling "requestWindowFeature( Window.FEATURE_PROGRESS );" in Activity
body: <p>I'm attempting to display loading progress for a WebView in an Android Activity. When I attempt to display the window's progress bar with:</p>
  
  <pre><code>requestWindowFeature( Window.FEATURE_PROGRESS );
  </code></pre>
  
  <p>as per <a href="http://developer.android.com/guide/appendix/faq/commontasks.html#progressbar" rel="noreferrer">http://developer.android.com/guide/appendix/faq/commontasks.html#progressbar</a> but at this point I get a debugging error.</p>
  
  <p>When the error occurs I see a new tab "ActivityThread.performLaunchActivity" in Eclipse which has a message "Source not found." and a button "Edit Source Lookup Path...".</p>
  
  <p>When I remove the offending line I don't get this error.</p>
  
  <p>What could be causing this problem? Do I need to set a permission in the AndroidManifest.xml file or is there something else I'm missing?</p>