Fatal error: Uncaught Error: Class "Wikibase\Repo\Api\EntityLoadingHelper" not found in /var/www/html/w/extensions/Wikibase/repo/includes/Api/EntitySavingHelper.php:38 Stack trace: #0 {main} thrown in /var/www/html/w/extensions/Wikibase/repo/includes/Api/EntitySavingHelper.php on line 38