domapping plugin is not working

i have created sub domain based multisite.
now i tried to map http://blog.esplet.si to purarajasthan.com

but it returns error domain name is unavailable to access

purarajasthan.com this was on godaddy but i have pointed to same cpanel where is http://www.esplet.si hosted,

can you let me know what is problem is there
we need reply fast asap
thanks