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java.lang.NullPointerException at at$800( at$13.changed( at$13.changed( at com.sun.javafx.binding.ExpressionHelper$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