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