Fatal error: Uncaught Error: Interface "Magento\Framework\Option\ArrayInterface" not found in /var/www/magento/html/app/code/BBNT/Base/Model/Adminhtml/System/Config/Source/Customer/Group.php:19 Stack trace: #0 {main} thrown in /var/www/magento/html/app/code/BBNT/Base/Model/Adminhtml/System/Config/Source/Customer/Group.php on line 19