Fatal error: Uncaught Error: Interface "MediaWiki\Preferences\Hook\GetPreferencesHook" not found in C:\xampp\htdocs\extensions\DiscussionTools\includes\Hooks\PreferenceHooks.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\DiscussionTools\includes\Hooks\PreferenceHooks.php on line 20