Fatal error: Uncaught Error: Interface "Psr\EventDispatcher\EventDispatcherInterface" not found in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-core/Classes/EventDispatcher/EventDispatcher.php:31 Stack trace: #0 {main} thrown in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-core/Classes/EventDispatcher/EventDispatcher.php on line 31