Problem in adding add-on domain

[shashank.coolguy1868]

when i am trying to add add-on domain following error message displayed
"Error from park wrapper: Sorry, cannot determine nameserver IPs. Please make sure that the domain is registered with a valid domain registrar."
my domain name is helloashu.co.cc

 

[Livewire]

Your nameservers at co.cc are set to the defaults; they need to be set to ns1.x10hosting.com and ns2.x10hosting.com first.