Problem while working with Standard KM Layoutset

Hi All,

We are facing a typical problem with KM layout sets.

Few of the standard layout sets are not working

like NewsBrowser.

When we navigate into the folder of the iview it throughs error

403

The requested operation is forbidden for this resource.

We navigate to the layout set link under

System admin >Km adminstration >Content managment-->User Interface (here we get warning Invalid areas Settings)

--> Setting(here we get a warning Invalid topics layout set)

Please help us in this regards.

Sai