Every time I try to buy a gem pack on facebook, I get this error message:

Any ideas what could this be? It has been like this from a while (around 7 hours)

No idea
did you tried another browser . clearing browser cache etc ?

@Haka-Taka yep, both Firefox and Chrome the same. I'll try clearing the cache, but I doubt it would help.
Edit: yep, didn't help.

No idea then .
i am not even sure who you should contact for support .. FB or SP !

Now I can't buy gems even on android

It is related to the account then , maybe you should contact sp

@Haka-Taka I did it right now, I hope it's not account related.

Edit: Tried purchasing in a different app, and it worked perfectly.

Looks like support is sleeping ... no answer at all

Edit: they told me to contact Google Play Support and said nothing about facebook ........

Edit: I tried it on my android phone (not emulator), and the purchase was succesful (bought 25 gems to see if it works).

So it seems like it's not account related (I think it's a facebook related problem)