Fatal error: Uncaught Error: Class 'League\OAuth1\Client\Server\Server' not found in C:\xampp\htdocs\admin\vendor\league\oauth1-client\src\Server\Xing.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\league\oauth1-client\src\Server\Xing.php on line 7