Hi, is your goodybag expiring tonight?
If so.. The error message doesn't indicate the real reason for the issue
its because you can't buy a goodybag after 10pm on the last day of your about to expire goodybag
(you can't buy a goodybag to queue after 9pm on the top up line)
You'll now need to wait till after midnight to buy a goodybag
Are you buying with a debit card or PayPal or your balance?