Control panel not allowing me to change main domain back

[leeka26]

Hi

I changed my main domain a couple of weeks ago from a co.cc free domain, and I want to change it back to the co.cc now but it doesn't let me, saying "The domain you have supplied is already in use.". But my co.cc domain is registered to x10 hosting nameservers in control panel at www.co.cc.
How can I change my main domain back to co.cc?

Thanks

[descalzo]

I see co.cc domains as parked and sub domains. Try removing those first.