title: Error: required: android:support.v4.FragmentManager, found: android.app.FragmentManager
body: <pre><code> FragmentManager manager = getFragmentManager();
  </code></pre>
  
  <p>It is giving the error</p>
  
  <blockquote>
    <p>required : android:support.v4.FragmentManager<br>
    found: android.app.FragmentManager</p>
  </blockquote>
  
  <p>I am using API 15</p>