Fatal error: Uncaught Error: Interface "Composer\Plugin\PluginInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-composer-installers/src/Installer/Plugin.php:29 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-composer-installers/src/Installer/Plugin.php on line 29