Fatal error: Uncaught Error: Interface "TYPO3\CMS\Install\Updates\UpgradeWizardInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/in2code/femanager/Classes/Updates/PluginUpdater.php:24 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/in2code/femanager/Classes/Updates/PluginUpdater.php on line 24