Fatal error: Uncaught Error: Interface "onesignal\client\model\ModelInterface" not found in /opt/lampp/htdocs/msjmaterial/vendor/onesignal/onesignal-php-api/lib/model/PropertiesObject.php:46 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/msjmaterial/vendor/onesignal/onesignal-php-api/lib/model/PropertiesObject.php on line 46