Fatal error: Uncaught Error: Class "EasyRdf\Literal" not found in /var/www/html/vendor/sweetrdf/easyrdf/tests/EasyRdf/MyDatatypeClass.php:18 Stack trace: #0 {main} thrown in /var/www/html/vendor/sweetrdf/easyrdf/tests/EasyRdf/MyDatatypeClass.php on line 18