How to control when more then one ratiobutton active?

I used pnp LDB, in these i am created 6 radiobuttons.

Radiodutton 1 use : List Display

Radiodutton 2 use : Grid Display

Radiodutton 3 use : Paper Display

Radiodutton 4 use : Download

Radiodutton 5 use : Send Email

Radiodutton 6 use :  Application Server

Here List & Grid display are working and remaining any one Radiobutton select and execute. It is show error i.e 'More then one radio button is active'.

How i can control it. Plese give me Idea about that.