Fatal error: Uncaught Error: Class 'Laravel\Socialite\Two\AbstractProvider' not found in C:\xampp7\htdocs\sigpkl\vendor\laravel\socialite\src\Two\SlackProvider.php:8 Stack trace: #0 {main} thrown in C:\xampp7\htdocs\sigpkl\vendor\laravel\socialite\src\Two\SlackProvider.php on line 8