Fatal error: Uncaught Error: Class "yii\helpers\BaseFileHelper" not found in /var/www/html/web/yii/basic/vendor/yiisoft/yii2/helpers/FileHelper.php:17 Stack trace: #0 {main} thrown in /var/www/html/web/yii/basic/vendor/yiisoft/yii2/helpers/FileHelper.php on line 17