Fatal error: Uncaught Error: Interface "TYPO3\CMS\Backend\Toolbar\ToolbarItemInterface" not found in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-backend/Classes/Backend/ToolbarItems/SystemInformationToolbarItem.php:42 Stack trace: #0 {main} thrown in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-backend/Classes/Backend/ToolbarItems/SystemInformationToolbarItem.php on line 42