Fatal error: Uncaught UnexpectedValueException: callback 'MediaWiki\Extension\VisualEditor\Hooks::onRegistration' is not callable in /data/TRAUMKULT/Lexikon-Traumkultur/includes/registration/ExtensionRegistry.php:556 Stack trace: #0 /data/TRAUMKULT/Lexikon-Traumkultur/includes/registration/ExtensionRegistry.php(317): ExtensionRegistry->exportExtractedData(Array) #1 /data/TRAUMKULT/Lexikon-Traumkultur/includes/Setup.php(285): ExtensionRegistry->loadFromQueue() #2 /data/TRAUMKULT/Lexikon-Traumkultur/includes/WebStart.php(92): require_once('/data/TRAUMKULT...') #3 /data/TRAUMKULT/Lexikon-Traumkultur/index.php(44): require('/data/TRAUMKULT...') #4 {main} thrown in /data/TRAUMKULT/Lexikon-Traumkultur/includes/registration/ExtensionRegistry.php on line 556