Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\Event" not found in /usr/home/mw2p5ujyzt/www/htdocs/mode2_piwik/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/GenericEvent.php:21 Stack trace: #0 {main} thrown in /usr/home/mw2p5ujyzt/www/htdocs/mode2_piwik/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/GenericEvent.php on line 21