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Attempt to invoke virtual method 'int android.view.ViewGroup.indexOfChild(android.view.View)' on a null object
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.ViewGroup.indexOfChild(android.view.View)' on a null object	at com.alexvasilkov.foldablelayout.UnfoldableView.switchViews(UnfoldableView.java:384)	at com.alexvasilkov.foldablelayout.UnfoldableView.clearCoverViewInternal(UnfoldableView.java:368)	at com.alexvasilkov.foldablelayout.UnfoldableView.onFoldedBack(UnfoldableView.java:150)	at com.alexvasilkov.foldablelayout.UnfoldableView.setState(UnfoldableView.java:186)	at com.alexvasilkov.foldablelayout.UnfoldableView.setFoldRotation(UnfoldableView.java:254)	at com.alexvasilkov.foldablelayout.FoldableListLayout.setFoldRotation(FoldableListLayout.java:251)	at android.animation.PropertyValuesHolder.nCallFloatMethod(Native Method)	at android.animation.PropertyValuesHolder.access$400(PropertyValuesHolder.java:37)	at android.animation.PropertyValuesHolder$FloatPropertyValuesHolder.setAnimatedValue(PropertyValuesHolder.java:1296)	at android.animation.ObjectAnimator.animateValue(ObjectAnimator.java:981)	at android.animation.ValueAnimator.animationFrame(ValueAnimator.java:1384)	at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1427)	at android.animation.ValueAnimator$AnimationHandler.doAnimationFrame(ValueAnimator.java:759)	at android.animation.ValueAnimator$AnimationHandler$1.run(ValueAnimator.java:801)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)	at android.view.Choreographer.doCallbacks(Choreographer.java:670)	at android.view.Choreographer.doFrame(Choreographer.java:603)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:234)	at android.app.ActivityThread.main(ActivityThread.java:5526)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)