Fatal error: Uncaught Error: Class "Rector\Rector\AbstractRector" not found in /var/www/html/dev.hallescherfc.de/vendor/ssch/typo3-rector/rules/TYPO312/v0/MigrateBackendModuleRegistrationRector.php:36 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/ssch/typo3-rector/rules/TYPO312/v0/MigrateBackendModuleRegistrationRector.php on line 36