Unable to make any Customize in UWL

Hi All,

Since i want to make the Task as first tab in the UWL.

When I go to

System Admin -> System Config -> Universal Worklist & Workflow -> Universal Worklist - Administration --> Click to Configure Item Types and Customize Views Using a Wizard -->

Customize the look of the UWL main page

I am not getting any option to select or deselect Tabs from the list.

And when I try to click Add Tab to a view I am getting a null point exception error.

Can anyone suggest how to overcome this error.

Thanks

Ash