title: Android: Lint says - Class referenced in the layout file, was not found in the project or the libraries
body: <p>In my app, I am using <a href="https://github.com/chrisbanes/Android-PullToRefresh" rel="noreferrer">Pull TO Refresh list view</a> library. I had designed layouts for all screens respectively. When I ran lint on my project, in one of my layout file for xlarge screen, it gave me fatal error: </p>
  
  <blockquote>
    <p>Class referenced in the layout file,
    com.handmark.pulltorefresh.library.PullToRefreshListView, was not
    found in the   project or the libraries</p>
  </blockquote>
  
  <p>While in same layout file for other screens, it is giving no error at all. Also, I had used same library in other layouts of my file, where it does not give any error. It is giving same error for <code>Google Maps</code> api as well. My project targets Google Api level 16 and I had checked, all libraries are added to it. But,the error doesn't go away even on cleaning project.</p>