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I have recently purchased the RBS WorldPay module, and am having issue with it. When I try and process a payment it goes through all the WP stages ok and then when it tries to redirect to our store the following message appear "The cart cannot be loaded, or an order has already been placed using this cart.". Having checked the order history the payment seems to have been accepted is this possibly a Callback issue? What would be the best solution? I have tried to contact Prestashop but they have failed to reply. By the way I am using PS V1.5.4.1 your help is much appreciated. After having given up on the WorldPay module developed by PrestaShop, decided to try another worldpay module by modulesmarket for less than half price (compared to PrestaShop developed version) on the PrestaShop addons site: http://addons.presta...0-worldpay.html This module is a lot more configurable and the level of support that I have received from the developer has been prompt and simply outstanding and will recommend this module to anyone who is looking for a fully functional worldpay module.