Fatal error: Uncaught Error: Interface "MediaWiki\Extension\BetaFeatures\Hooks\GetBetaFeaturePreferencesHook" not found in /var/www/html/w/extensions/MultimediaViewer/includes/BetaFeatureHookHandler.php:16 Stack trace: #0 {main} thrown in /var/www/html/w/extensions/MultimediaViewer/includes/BetaFeatureHookHandler.php on line 16