Fatal error: Uncaught Error: Class "TYPO3\CMS\Backend\Tree\AbstractTree" not found in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-core/Classes/Tree/TableConfiguration/TableConfigurationTree.php:23 Stack trace: #0 {main} thrown in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-core/Classes/Tree/TableConfiguration/TableConfigurationTree.php on line 23