Fatal error: Uncaught Error: Interface "Nexmo\Entity\JsonSerializableInterface" not found in /home/instituto/public_html/sapc/laravel/vendor/nexmo/client/src/Account/Balance.php:10 Stack trace: #0 {main} thrown in /home/instituto/public_html/sapc/laravel/vendor/nexmo/client/src/Account/Balance.php on line 10