ava.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid item position 20(offset:20).state:21

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ava.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid item position 20(offset:20).state:21
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:3300)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:3258)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1803)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1302)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1265)
at android.support.v7.widget.LinearLayoutManager.scrollBy(LinearLayoutManager.java:1093)
at android.support.v7.widget.LinearLayoutManager.scrollVerticallyBy(LinearLayoutManager.java:956)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:894)
at android.view.Choreographer.doCallbacks(Choreographer.java:696)
at android.view.Choreographer.doFrame(Choreographer.java:628)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:880)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5776)

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