Fatal error: Uncaught Error: Class "Magento\Rule\Model\ResourceModel\AbstractResource" not found in /home/airtimer/public_html/vendor/magento/module-catalog-rule/Model/ResourceModel/Rule.php:21 Stack trace: #0 {main} thrown in /home/airtimer/public_html/vendor/magento/module-catalog-rule/Model/ResourceModel/Rule.php on line 21