Cheque/Bankwire white page or error 500

[PsychoZzzorD]

Hi everybody.

As said in the title I have a little problem with my cheque and bankwire module.
When I confirm my order, I get a white page or sometimes an error 500.

After i tried to uninstall reinstall the two modules, I put on the dev mod and this is what the debug mod renders :

"Fatal error: Uncaught Error: Class 'OrderCarrier' not found in /home/web/prestashop/Static_Swim/classes/PaymentModule.php:373 Stack trace: #0 /home/web/prestashop/Static_Swim/modules/bankwire/controllers/front/validation.php(64): PaymentModuleCore->validateOrder(941, '10', 99.48, 'Bank wire', NULL, Array, 1, false, 'c5d0f78ae2004e5...') #1 /home/web/prestashop/Static_Swim/classes/controller/Controller.php(178): BankwireValidationModuleFrontController->postProcess() #2 /home/web/prestashop/Static_Swim/classes/Dispatcher.php(367): ControllerCore->run() #3 /home/web/prestashop/Static_Swim/index.php(28): DispatcherCore->dispatch() #4 {main} thrown in /home/web/prestashop/Static_Swim/classes/PaymentModule.php on line 373"

So I went to this file and looked out to see if there was something strange but I saw nothing, here's the code of PaymentModule.php :

// Adding an entry in order_carrier table
                    if (!is_null($carrier)) {
                        $order_carrier = new OrderCarrier();
                        $order_carrier->id_order = (int)$order->id;
                        $order_carrier->id_carrier = (int)$id_carrier;
                        $order_carrier->weight = (float)$order->getTotalWeight();
                        $order_carrier->shipping_cost_tax_excl = (float)$order->total_shipping_tax_excl;
                        $order_carrier->shipping_cost_tax_incl = (float)$order->total_shipping_tax_incl;
                        $order_carrier->add();
                    }

I searched a lot of old topics about those errors, but I found nothing :/

I hope somebody will be able to enlight me on this