My event is showing the error message "Sorry, this event is currently unavailable. Please contact the creator of this event." Help!?

This support article applies to RSVPify 2.0 only.

Problem: Your event(s) are showing the error message "Sorry, this event is currently unavailable. Please contact the creator of this event."

Solution: Your RSVPify plan was cancelled and expired or we had trouble charging your credit card and were unable to renew your subscription. You can re-upgrade your account at any time to restore access to your event(s), premium tools and features.