exception.class.missing._Unknown_: View Holder 2
  at androidx.recyclerview.widget.RecyclerView.handleMissingPreInfoForChangeError (RecyclerView.java:4124)
  at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep3 (RecyclerView.java:4048)
  at androidx.recyclerview.widget.RecyclerView.dispatchLayout (RecyclerView.java:3718)
  at androidx.recyclerview.widget.RecyclerView.onLayout (RecyclerView.java:4260)
  at android.view.View.layout (View.java:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  at android.widget.FrameLayout.layoutChildren (FrameLayout.java:323)
  at android.widget.FrameLayout.onLayout (FrameLayout.java:261)
  at android.view.View.layout (View.java:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  at androidx.viewpager.widget.ViewPager.onLayout (ViewPager.java:1775)
  at android.view.View.layout (View.java:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  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:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  at android.widget.FrameLayout.layoutChildren (FrameLayout.java:323)
  at android.widget.FrameLayout.onLayout (FrameLayout.java:261)
  at android.view.View.layout (View.java:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  at com.google.android.material.appbar.HeaderScrollingViewBehavior.layoutChild (HeaderScrollingViewBehavior.java:148)
  at com.google.android.material.appbar.ViewOffsetBehavior.onLayoutChild (ViewOffsetBehavior.java:41)
  at com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior.onMeasureChild (AppBarLayout.java:1631)
  at com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior.setTopAndBottomOffset (AppBarLayout.java:1631)
  at com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior.onLayoutChild (AppBarLayout.java:1631)
  at androidx.coordinatorlayout.widget.CoordinatorLayout.onLayout (CoordinatorLayout.java:898)
  at android.view.View.layout (View.java:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  at androidx.drawerlayout.widget.DrawerLayout.onLayout (DrawerLayout.java:1231)
  at android.view.View.layout (View.java:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  at android.widget.FrameLayout.layoutChildren (FrameLayout.java:323)
  at android.widget.FrameLayout.onLayout (FrameLayout.java:261)
  at android.view.View.layout (View.java:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  at android.widget.FrameLayout.layoutChildren (FrameLayout.java:323)
  at android.widget.FrameLayout.onLayout (FrameLayout.java:261)
  at android.view.View.layout (View.java:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  at android.widget.FrameLayout.layoutChildren (FrameLayout.java:323)
  at android.widget.FrameLayout.onLayout (FrameLayout.java:261)
  at android.view.View.layout (View.java:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  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:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  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:888)
  at android.view.View.layout (View.java:18804)
  at android.view.ViewGroup.layout (ViewGroup.java:5951)
  at android.view.ViewRootImpl.performLayout (ViewRootImpl.java:2659)
  at android.view.ViewRootImpl.performTraversals (ViewRootImpl.java:2375)
  at android.view.ViewRootImpl.doTraversal (ViewRootImpl.java:1526)
  at android.view.ViewRootImpl$TraversalRunnable.run (ViewRootImpl.java:7102)
  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:6682)
  at java.lang.reflect.Method.invoke (Method.java)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1534)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1424)