Fatal error: Uncaught Error: Interface "TYPO3\CMS\Backend\Toolbar\ToolbarItemInterface" not found in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-backend/Classes/Backend/ToolbarItems/UserToolbarItem.php:37 Stack trace: #0 {main} thrown in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-backend/Classes/Backend/ToolbarItems/UserToolbarItem.php on line 37