Fatal error: Uncaught Error: Class "TYPO3\CMS\Core\Authentication\AbstractUserAuthentication" not found in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-core/Classes/Authentication/BackendUserAuthentication.php:66 Stack trace: #0 {main} thrown in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-core/Classes/Authentication/BackendUserAuthentication.php on line 66