Fatal error: Uncaught Error: Class "yii\base\Event" not found in /var/www/html/prod/vendor/yii2-starter-kit/yii2-file-kit/src/events/UploadEvent.php:10 Stack trace: #0 {main} thrown in /var/www/html/prod/vendor/yii2-starter-kit/yii2-file-kit/src/events/UploadEvent.php on line 10