Fatal error: Uncaught Error: Class "Nexmo\Client\Callback\Callback" not found in /home/instituto/public_html/sapc/laravel/vendor/nexmo/client/src/Voice/Message/Callback.php:13 Stack trace: #0 {main} thrown in /home/instituto/public_html/sapc/laravel/vendor/nexmo/client/src/Voice/Message/Callback.php on line 13