Fatal error: Uncaught Error: Class 'TimelineEvent' not found in C:\inetpub\wwwroot\mantis\core\classes\IssueAssignedTimelineEvent.class.php:30 Stack trace: #0 {main} thrown in C:\inetpub\wwwroot\mantis\core\classes\IssueAssignedTimelineEvent.class.php on line 30