Fatal error: Uncaught Error: Class 'Nexmo\Client\Credentials\AbstractCredentials' not found in /opt/lampp/htdocs/kuesioner/vendor/nexmo/client-core/src/Client/Credentials/Container.php:11 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/kuesioner/vendor/nexmo/client-core/src/Client/Credentials/Container.php on line 11