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java.lang.NullPointerException: 	at	at$800(	at$11.changed(	at$11.changed(	at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(	at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(	at$ReadOnlyPropertyImpl.fireValueChangedEvent(	at	at	at	at javafx.scene.control.ToggleGroup$2.set(	at javafx.scene.control.ToggleGroup$2.set(	at javafx.scene.control.ToggleGroup.selectToggle(	at javafx.scene.control.RadioMenuItem$2.invalidated(	at	at	at javafx.scene.control.RadioMenuItem.setSelected(	at$	at com.sun.javafx.application.PlatformImpl$	at Method)	at$100(	at$2$	at