Fatal error: Uncaught Error: Interface "TYPO3\CMS\Dashboard\Widgets\WidgetInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/konradmichalik/typo3-environment-indicator/Classes/Widgets/EnvironmentIndicatorWidget.php:37 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/konradmichalik/typo3-environment-indicator/Classes/Widgets/EnvironmentIndicatorWidget.php on line 37