Fatal error: Uncaught Error: Class "MediaWiki\Diff\TextDiffer\BaseTextDiffer" not found in /var/www/html/w/includes/Diff/TextDiffer/Wikidiff2TextDiffer.php:11 Stack trace: #0 {main} thrown in /var/www/html/w/includes/Diff/TextDiffer/Wikidiff2TextDiffer.php on line 11