Mobstac.1462

I recently had the same issue. I purchased a small amount of gems without issue. Then I attempted to make a second purchase about an hour and half later. I attempted to repurchase 8000 gems to no avail. I received the same message most other player with this issue were receiving "Unfortunately an error has occurred. Please try again later!" No matter how many times I tried I couldn't get out of the loop and complete the transaction. I sent a ticket to Support and within 48 hours they had my account fixed and able to purchase gems again.