You have a glitch. Only Support can fix it for you. Put in a ticket, give your player i.d. You can include the screenshot - they will have seen this error before.
Do you know how to do a ticket or do you need the instructions? I don't have the set saved on my iPad.
go here https://portal.pixelfederation.com/en/diggysadventure/support
scroll down and choose category Gameplay, then Bugs And Issues. Monitor your email for a reply, check spam and junk folders. Allow 1-2 business days.