Fatal error: Uncaught Error: Class 'SMW\DataValues\AbstractMultiValue' not found in /home/mapeador/solecov2/w/extensions/SemanticMediaWiki/src/DataValues/ReferenceValue.php:45 Stack trace: #0 {main} thrown in /home/mapeador/solecov2/w/extensions/SemanticMediaWiki/src/DataValues/ReferenceValue.php on line 45