Fatal error: Class 'Symfony\Component\EventDispatcher\EventDispatcher' not found in /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/Fixtures/TestEventDispatcher.php on line 17

Call Stack:
    0.0003     232408   1. {main}() /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/Fixtures/TestEventDispatcher.php:0