Fatal error: Uncaught Error: Class "Vonage\Client\Credentials\AbstractCredentials" not found in /home/demoweb/public_html/placementship-backend/vendor/nexmo/client-core/src/Client/Credentials/OAuth.php:23 Stack trace: #0 {main} thrown in /home/demoweb/public_html/placementship-backend/vendor/nexmo/client-core/src/Client/Credentials/OAuth.php on line 23