i just began playing the game, i see that i have 50 credits. i want to buy a pack of mirracle balls for 49 credits, it shows 50 but when i go to purchase the balls it says 0 credits.yes the balls are in my league, i still have 50 credits. confused,is this a game error? i have plenty of friends who are new as well that are able to make the same transaction... please help.