CBSubs lifetime default

Hi all, I see in the settings that if i make it non-compulsory to select a plan that there is some kind of lifetime default that you automatically get signed up to (and an option to say don't even bother keeping records for that). Yet if a plan isnt chosen i get an error saying that my plan combination is invalid??
Any help greatly appreciated.
Do i need to make a lifetime plan and set it as the default or something - cause i'd rather not.

If you have "Exclusive" plans then at least one of them is mandatory/required. Ensure none of your plans are exclusive and they can register without a plan.