Fatal error: Uncaught Error: Class "yii\base\Behavior" not found in /var/www/html/prod/vendor/yii2-starter-kit/yii2-file-kit/src/behaviors/UploadBehavior.php:15 Stack trace: #0 {main} thrown in /var/www/html/prod/vendor/yii2-starter-kit/yii2-file-kit/src/behaviors/UploadBehavior.php on line 15