Fatal error: Uncaught Error: Class "Magento\Checkout\Block\Cart" not found in /var/www/magento/html/app/code/BBNT/MyBag/Block/MyCart.php:8 Stack trace: #0 {main} thrown in /var/www/magento/html/app/code/BBNT/MyBag/Block/MyCart.php on line 8