Fatal error: Uncaught Error: Interface "MediaWiki\Hook\ParserOutputPostCacheTransformHook" not found in /var/www/html/extensions/DiscussionTools/includes/Hooks/ParserHooks.php:25 Stack trace: #0 {main} thrown in /var/www/html/extensions/DiscussionTools/includes/Hooks/ParserHooks.php on line 25