Fatal error: Uncaught Error: Class 'Nexmo\Client\Credentials\AbstractCredentials' not found in /home/caistbuw/public_html/vendor/vonage/client-core/src/Client/Credentials/Basic.php:15 Stack trace: #0 {main} thrown in /home/caistbuw/public_html/vendor/vonage/client-core/src/Client/Credentials/Basic.php on line 15