Fatal error: Uncaught Error: Class 'AbstractCheckoutStep' not found in /home6/maan/public_html/skleptest.maan.net.pl/classes/checkout/CheckoutPaymentStep.php:28 Stack trace: #0 {main} thrown in /home6/maan/public_html/skleptest.maan.net.pl/classes/checkout/CheckoutPaymentStep.php on line 28