Fatal error: Uncaught Error: Class "Laravel\Socialite\Two\AbstractProvider" not found in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\laravel\socialite\src\Two\SlackOpenIdProvider.php:8 Stack trace: #0 {main} thrown in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\laravel\socialite\src\Two\SlackOpenIdProvider.php on line 8