Fatal error: Uncaught Error: Class "yii\helpers\FileHelper" not found in /users/quirl/www/filemanager/spark/protected/humhub/modules/file/libs/FileHelper.php:30 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/file/libs/FileHelper.php on line 30