Fatal error: Uncaught Error: Class 'Nexmo\Client\Credentials\AbstractCredentials' not found in C:\xampp\htdocs\print-bk\vendor\nexmo\client\src\Client\Credentials\OAuth.php:11 Stack trace: #0 {main} thrown in C:\xampp\htdocs\print-bk\vendor\nexmo\client\src\Client\Credentials\OAuth.php on line 11