Both Cancel order and Send refund are NOT working

[somanypostcards]

When I try to cancel an order I get an error message:

Well, that didn't go as planned

Please go back and try again

When I try to send a refund for the order I couldn't cancel I get an error message when I click Review refund:

We ran into a problem. Please try again later.

[somanypostcards]

Today I was able to use Cancel order successfully.