Fatal error: Uncaught Error: Class "EasyRdf\Serialiser\Ntriples" not found in /var/www/html/vendor/sweetrdf/easyrdf/lib/Serialiser/Rapper.php:52 Stack trace: #0 {main} thrown in /var/www/html/vendor/sweetrdf/easyrdf/lib/Serialiser/Rapper.php on line 52