Fatal error: Uncaught Error: Class "League\OAuth2\Client\Provider\AbstractProvider" not found in C:\WebServer\htdocs\bookshelf\app\Access\Oidc\OidcOAuthProvider.php:19 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\app\Access\Oidc\OidcOAuthProvider.php on line 19