title: Android Project Fragment Transition throwing Exception when Build target used New API Level 21
body: <p><strong>Exception is:</strong></p>
  <p><strong>&quot;Unable to resolve superclass of  L android/support/v4/app/FragmentTransitionCompat21$1;&quot;</strong></p>
  <p>I am trying to Pop the last Fragment Transition from the Fragment Manager's Fragment Back Stack, using the following function:</p>
  <p><code>getSupportFragmentManager().popBackStack();</code> ,</p>
  <p>When I did this, function call throwing following Error. This is only happening when I used New Android API Version 21 as Build target.</p>
  <p>Same Code work fine with Older API Version 20.</p>
  <p>Error: Could not find superclass of 'android.support.v4.app.FragmentTransitionCompat21$1'</p>
  <p>It seems an Inner Class in the Base class of 'FragmentTransitionCompat21'.</p>
  <p><strong>Error:</strong></p>
  <pre><code>W/dalvikvm(1356): Unable to resolve superclass of Landroid/support/v4/app/FragmentTransitionCompat21$1; (1082)
  
  W/dalvikvm(1356): Link of class 'Landroid/support/v4/app/FragmentTransitionCompat21$1;' failed
  
  E/dalvikvm(1356): Could not find class 'android.support.v4.app.FragmentTransitionCompat21$1', referenced from method android.support.v4.app.FragmentTransitionCompat21.setEpicenter
  
  W/dalvikvm(1356): VFY: unable to resolve new-instance 358 (Landroid/support/v4/app/FragmentTransitionCompat21$1;) in Landroid/support/v4/app/FragmentTransitionCompat21;
  </code></pre>
  <p>Does anybody find similar Error? please help how to solve this, thank you.</p>