yesterday I spent every green token I had on vixen bunnies and everything seemed fine. Today I obtained some more greens through trading and wanted to exchange them for 'vixens' as well, but whenever I click the 'Trade now!' button visible under the bunny, the following message shows up:

Leaving the fact that I'm having a hard time deciphering the above text aside, I'm unsure of what the source of this problem is because as I said before, yesterday everything worked perfectly.
Also tried buying a sunback bunny. It went smoothly, so the vixen appears to be the only 'problematic' one here.
I'd be very grateful if this issue got solved as I paid through the nose for my tokens for the sole purpose of spending them on a specific kind of bunny. Seeing them go to waste would make me very sad. D: