Fatal error: Uncaught Error: Interface 'DeferrableUpdate' not found in /home/mapeador/solecov2/w/extensions/SemanticMediaWiki/src/MediaWiki/Deferred/HashFieldUpdate.php:22 Stack trace: #0 {main} thrown in /home/mapeador/solecov2/w/extensions/SemanticMediaWiki/src/MediaWiki/Deferred/HashFieldUpdate.php on line 22