Fatal error: Uncaught Error: Class "yii\helpers\Html" not found in /var/www/html/prod/vendor/zxbodya/yii2-gallery-manager/views/galleryManager.php:11 Stack trace: #0 {main} thrown in /var/www/html/prod/vendor/zxbodya/yii2-gallery-manager/views/galleryManager.php on line 11