Fatal error: Uncaught Error: Interface "Psr\Http\Server\RequestHandlerInterface" not found in /srv/www/htdocs/moodle/lib/tests/fixtures/router/route_implementing_request_handler_interface.php:26 Stack trace: #0 {main} thrown in /srv/www/htdocs/moodle/lib/tests/fixtures/router/route_implementing_request_handler_interface.php on line 26