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Attempt to invoke virtual method 'int android.view.View.getVisibility()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getVisibility()' on a null object reference	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:288)	at android.widget.FrameLayout.onLayout(FrameLayout.java:273)	at android.view.View.layout(View.java:16630)	at android.view.ViewGroup.layout(ViewGroup.java:5437)	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)	at android.widget.FrameLayout.onLayout(FrameLayout.java:273)	at android.view.View.layout(View.java:16630)	at android.view.ViewGroup.layout(ViewGroup.java:5437)	at org.nativescript.widgets.CommonLayoutParams.layoutChild(CommonLayoutParams.java:189)	at org.nativescript.widgets.GridLayout.onLayout(GridLayout.java:353)	at android.view.View.layout(View.java:16630)	at android.view.ViewGroup.layout(ViewGroup.java:5437)	at org.nativescript.widgets.CommonLayoutParams.layoutChild(CommonLayoutParams.java:189)	at org.nativescript.widgets.ContentLayout.onLayout(ContentLayout.java:73)