Fatal error: Uncaught Error: Class 'Sendpulse\RestApi\ApiClient' not found in /var/www/u0820075/data/vendor/sendpulse/rest-api/example/index.php:21 Stack trace: #0 {main} thrown in /var/www/u0820075/data/vendor/sendpulse/rest-api/example/index.php on line 21