Fatal error: Uncaught Error: Class "Laravel\Socialite\Two\AbstractProvider" not found in C:\WebServer\htdocs\bookshelf\vendor\laravel\socialite\src\Two\BitbucketProvider.php:9 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\vendor\laravel\socialite\src\Two\BitbucketProvider.php on line 9