title: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/animation/AnimatorCompatHelper
body: <p>After updating Android Studio to version 2.3. Every time I swipe my ViewPager I keep getting this error and the app crashes:</p>
  
  <pre><code>03-23 17:19:19.437 28523-28523/? E/AndroidRuntime: FATAL EXCEPTION: main
     Process: com.irokotv.plus, PID: 28523
     java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/animation/AnimatorCompatHelper;
         at android.support.v7.widget.DefaultItemAnimator.resetAnimation(DefaultItemAnimator.java:515)
         at android.support.v7.widget.DefaultItemAnimator.animateAdd(DefaultItemAnimator.java:218)
         at android.support.v7.widget.SimpleItemAnimator.animateAppearance(SimpleItemAnimator.java:114)
         at android.support.v7.widget.RecyclerView.animateAppearance(RecyclerView.java:3528)
         at android.support.v7.widget.RecyclerView$4.processAppeared(RecyclerView.java:461)
         at android.support.v7.widget.ViewInfoStore.process(ViewInfoStore.java:249)
         at android.support.v7.widget.RecyclerView.dispatchLayoutStep3(RecyclerView.java:3385)
         at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3135)
         at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3568)
         at android.view.View.layout(View.java:18793)
         at android.view.ViewGroup.layout(ViewGroup.java:5952)
         at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1766)
         at android.view.View.layout(View.java:18793)
         at android.view.ViewGroup.layout(ViewGroup.java:5952)
         at android.support.design.widget.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:131)
         at android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:42)
         at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1364)
         at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:846)
         at android.view.View.layout(View.java:18793)
         at android.view.ViewGroup.layout(ViewGroup.java:5952)
         at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
         at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
         at android.view.View.layout(View.java:18793)
         at android.view.ViewGroup.layout(ViewGroup.java:5952)
         at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
         at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
         at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
         at android.view.View.layout(View.java:18793)
         at android.view.ViewGroup.layout(ViewGroup.java:5952)
         at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
         at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
         at android.view.View.layout(View.java:18793)
         at android.view.ViewGroup.layout(ViewGroup.java:5952)
         at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
         at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
         at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
         at android.view.View.layout(View.java:18793)
         at android.view.ViewGroup.layout(ViewGroup.java:5952)
         at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
         at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
         at com.android.internal.policy.DecorView.onLayout(DecorView.java:818)
         at android.view.View.layout(View.java:18793)
         at android.view.ViewGroup.layout(ViewGroup.java:5952)
         at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2615)
         at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2331)
         at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1490)
         at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7027)
         at android.view.Choreographer$CallbackRecord.run(Choreographer.java:927)
         at android.view.Choreographer.doCallbacks(Choreographer.java:702)
         at android.view.Choreographer.doFrame(Choreographer.java:638)
         at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:913)
         at android.os.Handler.handleCallback(Handler.java:751)
         at android.os.Handler.dispatchMessage(Handler.java:95)
         at android.os.Looper.loop(Looper.java:154)
         at android.app.ActivityThread.main(ActivityThread.java:6688)
         at java.lang.reflect.Method.invoke(Native Method)
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
  </code></pre>
  
  <p>The app use to work well before the update. I already cleaned the project. Invalidate caches and run a gradle clean. No idea what else what I can do/try. My coworker can build the project and it works without any issue.</p>