Fatal error: Uncaught Error: Class "craft\events\CancelableEvent" not found in /home/leasingm/public_html/public_html/vendor/craftcms/cms/src/events/UserAssignGroupEvent.php:18 Stack trace: #0 {main} thrown in /home/leasingm/public_html/public_html/vendor/craftcms/cms/src/events/UserAssignGroupEvent.php on line 18