Fatal error: Uncaught Error: Class "Magento\Framework\Model\AbstractExtensibleModel" not found in /home/airtimer/public_html/vendor/magento/module-page-builder/Model/Template.php:19 Stack trace: #0 {main} thrown in /home/airtimer/public_html/vendor/magento/module-page-builder/Model/Template.php on line 19