Fatal error: Uncaught Error: Class "Magento\Reward\Observer\PlaceOrder\Restriction\Backend" not found in /var/www/magento/html/generated/code/Magento/Reward/Observer/PlaceOrder/Restriction/Backend/Proxy.php:7 Stack trace: #0 {main} thrown in /var/www/magento/html/generated/code/Magento/Reward/Observer/PlaceOrder/Restriction/Backend/Proxy.php on line 7