Changing my domain problems

[ineedhelp_]

I try to change my domain to gavicoind.x10hosting.com to gavicoind.com
And error always says:
Hosting Domain Modification
submitted April 9 at 2:19 pm
W0UwxXUY3mh0
action status
Error
information
A change to your hosting account's primary domain.
result
A system error occurred while processing this action.

Error Code: 1E9F63B0

 

[xav0989]

This domain is already registered in the system. Did you add it as a addon or parked domain in cPanel?

 

[ineedhelp_]

I just need my main hosting domain set to www.gavicoind.com
not gavicoind.x10hosting.com

Yes, I have tried that. It always says

This Domain is already configured