Fatal error: Uncaught Error: Class "BookStack\Activity\Notifications\Messages\BaseActivityNotification" not found in C:\WebServer\htdocs\bookshelf\app\Activity\Notifications\Messages\PageCreationNotification.php:11 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\app\Activity\Notifications\Messages\PageCreationNotification.php on line 11