Fatal error: Uncaught Error: Class "Magento\Backend\Controller\Adminhtml\System\Design\Delete" not found in /var/www/magento/html/generated/code/Magento/Backend/Controller/Adminhtml/System/Design/Delete/Interceptor.php:7 Stack trace: #0 {main} thrown in /var/www/magento/html/generated/code/Magento/Backend/Controller/Adminhtml/System/Design/Delete/Interceptor.php on line 7