Fatal error: Uncaught Error: Class "Magento\Framework\Model\ResourceModel\Db\AbstractDb" not found in /home/airtimer/public_html/vendor/magento/module-authorization/Model/ResourceModel/Rules.php:21 Stack trace: #0 {main} thrown in /home/airtimer/public_html/vendor/magento/module-authorization/Model/ResourceModel/Rules.php on line 21