Fatal error: Uncaught Error: Interface "MediaWiki\Preferences\Hook\GetPreferencesHook" not found in /usr/www/otte/public/sphunt1/extensions/DiscussionTools/includes/Hooks/PreferenceHooks.php:20 Stack trace: #0 {main} thrown in /usr/www/otte/public/sphunt1/extensions/DiscussionTools/includes/Hooks/PreferenceHooks.php on line 20