Fatal error: Uncaught Error: Interface "SMW\DataValues\ValueValidators\ConstraintValueValidator" not found in /var/www/html/extensions/SemanticMediaWiki/src/DataValues/ValueValidators/UniquenessConstraintValueValidator.php:27 Stack trace: #0 {main} thrown in /var/www/html/extensions/SemanticMediaWiki/src/DataValues/ValueValidators/UniquenessConstraintValueValidator.php on line 27