Fatal error: Uncaught Error: Interface 'Nexmo\Client\Credentials\CredentialsInterface' not found in /home/caistbuw/public_html/vendor/vonage/client-core/src/Client/Credentials/AbstractCredentials.php:11 Stack trace: #0 {main} thrown in /home/caistbuw/public_html/vendor/vonage/client-core/src/Client/Credentials/AbstractCredentials.php on line 11