Fatal error: Uncaught Error: Class "yii\helpers\Html" not found in /users/quirl/www/filemanager/spark/protected/humhub/modules/ui/filter/widgets/views/checkboxInput.php:21 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/ui/filter/widgets/views/checkboxInput.php on line 21