Fatal error: Uncaught Error: Class "Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection" not found in /home/airtimer/public_html/vendor/dotmailer/dotmailer-magento2-extension-sms/Model/ResourceModel/SmsOrder/Collection.php:8 Stack trace: #0 {main} thrown in /home/airtimer/public_html/vendor/dotmailer/dotmailer-magento2-extension-sms/Model/ResourceModel/SmsOrder/Collection.php on line 8