Calendar disappeared

Calendar disappeared

I am in Zoho Creator, and clicked EDIT THIS APPLICATION to change which fields would display when a calendar appointment was opened. When I finished making the change, I clicked ACCESS THIS APPLICATION to view the calendar again. The calendar had disappeared, replaced with a message that says We are unable to fetch this data, sorry!
Please note that your data is SAFE.Report this problem to support@zohocreator.com

I edited again to reverse the change, but the calendar is still missing. I logged out and back in, but the calendar is still missing. I was planning to debut the application today, so this is a problem.