Fatal error: Uncaught Error: Class "yii\jui\Widget" not found in /users/quirl/www/filemanager/spark/protected/vendor/yiisoft/yii2-jui/Droppable.php:31 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/vendor/yiisoft/yii2-jui/Droppable.php on line 31