Fatal error: Uncaught Error: Class "Magento\Theme\Model\ResourceModel\Design\Collection" not found in /var/www/magento/html/generated/code/Magento/Theme/Model/ResourceModel/Design/Collection/Interceptor.php:7 Stack trace: #0 {main} thrown in /var/www/magento/html/generated/code/Magento/Theme/Model/ResourceModel/Design/Collection/Interceptor.php on line 7