Fatal error: Uncaught Error: Class "Magento\Checkout\Controller\Index\Index" not found in /var/www/magento/html/app/code/BBNT/Checkout/Controller/Index/Index.php:12 Stack trace: #0 {main} thrown in /var/www/magento/html/app/code/BBNT/Checkout/Controller/Index/Index.php on line 12