When you see this error message, something went wrong with forwarding your payment. Just try to make the payment again.
You do not have to worry about possibly double transferring the amount. All transfers are reviewed by a Liantis colleague. When you have made a double payment, the unnecessary amount will be refunded to your account.
Do you get the same error message again? Please contact My Liantis Support via the Help button. They are happy to help you.