i want to buy digital money from a site using paypal?

i want to buy "aP" in aeria games.
but everytime i want to pay using paypal. it says

We are unable to complete your request at this time. Please try again later. We apologize for the inconvenience.


what should i do?
what is the problem?
its not a scam.
money have been sent in paypal by my online buyers

. i have 45dollars there. i want to use it in this game.

this is annoying