Schedule view will not load

I’ve been using Appointment Hour Bookings for years with no issues, but a few days ago, I started getting this error message: “Sorry, could not load your data, please try again later” when I try to see the bookings in schedule view.

The plugin is fully updated, I’ve cleared my cache, and logged in and out. The issue is showing up on multiple different computers.

Has anyone had this issue? How did you get around it?