Fatal error: Uncaught Error: Class "TYPO3\CMS\Core\Http\AbstractApplication" not found in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-backend/Classes/Http/Application.php:33 Stack trace: #0 {main} thrown in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-backend/Classes/Http/Application.php on line 33