Cannot create an invoice (or do any Zoho Books stuff)

Cannot create an invoice (or do any Zoho Books stuff)

I upgraded from a Trial to the full version of Zoho One this morning (not sure if that matters, but I thought I would mention it).

I am currently having issues with the Zoho Books integration in Zoho Desk. Whenever I click the Books link in the ticket or try to create an invoice, I get an Internal Error pop up. Has anyone else encountered this?