Sync error: Database Metadata: (not found...

When my database attempts to do its scheduled sync, I get an error message. The message reads

Database Metadata: (not found ({ “error”: “File has been deleted” }))

I can still access the database and (as far as I can tell) all of the items in the database. What does this message mean, and how can I resolve it?

Please start a Support Ticket. Thank you.