Fatal error: Uncaught Error: Interface "TYPO3\CMS\Dashboard\Widgets\WidgetConfigurationInterface" not found in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-dashboard/Classes/Widgets/WidgetConfiguration.php:20 Stack trace: #0 {main} thrown in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-dashboard/Classes/Widgets/WidgetConfiguration.php on line 20