Fatal error: Uncaught UnexpectedValueException: callback 'MapsRegistration::onRegistration' is not callable in /usr/share/mediawiki/includes/registration/ExtensionRegistry.php:525 Stack trace: #0 /usr/share/mediawiki/includes/registration/ExtensionRegistry.php(279): ExtensionRegistry->exportExtractedData() #1 /usr/share/mediawiki/includes/Setup.php(278): ExtensionRegistry->loadFromQueue() #2 /usr/share/mediawiki/includes/WebStart.php(86): require_once('...') #3 /usr/share/mediawiki/index.php(44): require('...') #4 {main} thrown in /usr/share/mediawiki/includes/registration/ExtensionRegistry.php on line 525