title: Why could not find the android.widget.gallery class? how to fix it?
body: <p>There is a error which displays the XML. It says:</p>
  
  <blockquote>
    <p>The following classes could not be found:</p>
    
    <ul>
    <li>Gallery (Change to android.widget.Gallery, Fix Build Path, Edit XML)</li>
    </ul>
  </blockquote>
  
  <p>The <code>gallery.java</code> exists in the widget file. Why is there a error, and how do I fix this?</p>