Fatal error: Uncaught Error: Class "Magento\OfflineShipping\Model\Carrier\Freeshipping" not found in /var/www/magento/html/app/code/BBNT/OfflineShipping/Model/Carrier/Freeshipping.php:9 Stack trace: #0 {main} thrown in /var/www/magento/html/app/code/BBNT/OfflineShipping/Model/Carrier/Freeshipping.php on line 9