[Question] How do i use stack widget

Im tryint to use stack, but it never works and it logs (eww:19242): Gtk-WARNING **: 08:40:03.809: Child name '1' not found in GtkStack Idk why tho. this is the widget:

(defwidget powerSide []
	(stack
	:selected 1

		(updates)
		(label :text "no menu" :visible "false")
	)
)