Fatal error: Uncaught Error: Interface 'SMW\Exporter\DataItemMapper' not found in /home/mapeador/solecov2/w/extensions/SemanticMediaWiki/src/Exporter/ConceptMapper.php:29 Stack trace: #0 {main} thrown in /home/mapeador/solecov2/w/extensions/SemanticMediaWiki/src/Exporter/ConceptMapper.php on line 29