Collection Actuator: Camera not found

I’m trying to make menus be able to be switched, but when I try to do it with logic bricks, it will either say “No collection found, actuator won’t be converted” or “Collection Actuator: Camera not found”, and it does nothing.

How can I set up a switchable menu/overlay scene that can be switched if the Collection actuator does not find a menu/or camera when I request it to?