Fatal error: Uncaught Error: Interface "Symfony\Contracts\EventDispatcher\EventDispatcherInterface" not found in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-core/Classes/Adapter/EventDispatcherAdapter.php:25 Stack trace: #0 {main} thrown in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-core/Classes/Adapter/EventDispatcherAdapter.php on line 25