JAVA不兼容类型:对象不能转换为我的类型

I'm trying to make changes to my GUI in JavaFX by doing the work on a separate thread and returning the object required. However, after doing the work and task.setOnSucceeded() is triggered I attempt to retrieve the created object and get the error "incompatible types: Object cannot be converted to type VideoScrollPane".I'm trying to make changes to my GUI in JavaFX