Fatal error: Uncaught Error: Interface "MediaWiki\Installer\Hook\LoadExtensionSchemaUpdatesHook" not found in /home/floten1/q.tenbergen.ca/extensions/CheckUser/src/HookHandler/SchemaChangesHandler.php:18 Stack trace: #0 {main} thrown in /home/floten1/q.tenbergen.ca/extensions/CheckUser/src/HookHandler/SchemaChangesHandler.php on line 18