Fatal error: Uncaught Error: Class "Nexmo\Client\Callback\Callback" not found in /home/trombino/public_html/africa.trombino.org/vendor_new/nexmo/client/src/Network/Number/Callback.php:33 Stack trace: #0 {main} thrown in /home/trombino/public_html/africa.trombino.org/vendor_new/nexmo/client/src/Network/Number/Callback.php on line 33