Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home2/yiikharazmisabt/public_html/yii2-app/vendor/symfony/console/Event/ConsoleEvent.php:24 Stack trace: #0 {main} thrown in /home2/yiikharazmisabt/public_html/yii2-app/vendor/symfony/console/Event/ConsoleEvent.php on line 24