Fatal error: Uncaught Error: Interface "Illuminate\Contracts\Support\Arrayable" not found in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\laravel\slack-notification-channel\src\Slack\Contracts\ElementContract.php:7 Stack trace: #0 {main} thrown in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\laravel\slack-notification-channel\src\Slack\Contracts\ElementContract.php on line 7