Fatal error: Uncaught Error: Class "Payum\Core\GatewayFactory" not found in /home/flighto/e-commerce/vendor/sylius/paypal-plugin/src/Payum/Factory/PayPalGatewayFactory.php:20 Stack trace: #0 {main} thrown in /home/flighto/e-commerce/vendor/sylius/paypal-plugin/src/Payum/Factory/PayPalGatewayFactory.php on line 20