Fatal error: Uncaught Error: Interface "Illuminate\Contracts\Support\Htmlable" not found in /home/bimmertest/BookStack/app/Activity/Notifications/MessageParts/LinkedMailMessageLine.php:13 Stack trace: #0 {main} thrown in /home/bimmertest/BookStack/app/Activity/Notifications/MessageParts/LinkedMailMessageLine.php on line 13