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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)	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 android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)	at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)	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 com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2678)	at android.view.View.layout(View.java:16630)	at android.view.ViewGroup.layout(ViewGroup.java:5437)	at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2171)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1931)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)	at android.view.Choreographer.doCallbacks(Choreographer.java:670)	at android.view.Choreographer.doFrame(Choreographer.java:606)	at android.view.Choreographer$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:148)	at android.app.ActivityThread.main(ActivityThread.java:5417)	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)