Fatal error: Uncaught Error: Interface 'Vonage\Client\Callback\CallbackInterface' not found in /home/digitalproduct/public_html/onlinejobportal/vendor/vonage/client-core/src/Client/Callback/Callback.php:23 Stack trace: #0 {main} thrown in /home/digitalproduct/public_html/onlinejobportal/vendor/vonage/client-core/src/Client/Callback/Callback.php on line 23