Fatal error: Uncaught Error: Class "Vonage\Client\Credentials\AbstractCredentials" not found in /home/qrapp/public_html/vendor/vonage/client-core/src/Client/Credentials/SignatureSecret.php:7 Stack trace: #0 {main} thrown in /home/qrapp/public_html/vendor/vonage/client-core/src/Client/Credentials/SignatureSecret.php on line 7