Fatal error: Uncaught Error: Interface "Psr\EventDispatcher\StoppableEventInterface" not found in /srv/www/htdocs/moodle/lib/tests/fixtures/hook/stoppablehook.php:29 Stack trace: #0 {main} thrown in /srv/www/htdocs/moodle/lib/tests/fixtures/hook/stoppablehook.php on line 29