Adoption Center always empty

[Dinocanid]

I only have one adoptable on my site right now since I'm trying to work on the cosmetic stuff and features first. When go to the adoption center page, it always says:

Invalid Action Specified
There is not an adoptable available at this point, please come back later.

I tried completely deleting the adoptable and adding it again, but the center always says that message. Am I missing something? Adoptables can be obtained through an adoptshop just fine from the market page.