Fatal error: Uncaught Error: Class "Maknz\Slack\Payload" not found in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\alek13\slack\src\BlockElement.php:6 Stack trace: #0 {main} thrown in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\alek13\slack\src\BlockElement.php on line 6