Fatal error: Uncaught Error: Class "Magento\Quote\Model\QuoteManagement" not found in /var/www/magento/html/app/code/BBNT/Quote/Model/QuoteManagement.php:36 Stack trace: #0 {main} thrown in /var/www/magento/html/app/code/BBNT/Quote/Model/QuoteManagement.php on line 36