Fatal error: Uncaught Error: Class "yii\base\Behavior" not found in /var/www/html/prod/vendor/zxbodya/yii2-gallery-manager/GalleryBehavior.php:21 Stack trace: #0 {main} thrown in /var/www/html/prod/vendor/zxbodya/yii2-gallery-manager/GalleryBehavior.php on line 21