Fatal error: Class 'Symfony\Component\EventDispatcher\EventDispatcher' not found in /var/www/html/dev/spa/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/ContainerAwareEventDispatcher.php on line 25

Call Stack:
    0.0009     267872   1. {main}() /var/www/html/dev/spa/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/ContainerAwareEventDispatcher.php:0