Fatal error: Uncaught Error: Interface 'Psr\Http\Server\RequestHandlerInterface' not found in /var/www/vhosts/www.thomas-bartholomaeus.de/content/neoscms/Packages/Framework/Neos.Flow/Tests/Unit/Http/Fixtures/SpyRequestHandler.php:9 Stack trace: #0 {main} thrown in /var/www/vhosts/www.thomas-bartholomaeus.de/content/neoscms/Packages/Framework/Neos.Flow/Tests/Unit/Http/Fixtures/SpyRequestHandler.php on line 9