Fatal error: Uncaught Error: Class "Maknz\Slack\Payload" not found in C:\xampp\htdocs\snipe-it\vendor\alek13\slack\src\AttachmentField.php:4 Stack trace: #0 {main} thrown in C:\xampp\htdocs\snipe-it\vendor\alek13\slack\src\AttachmentField.php on line 4