Domain mapping not working troubleshooting assistance required


I'm having trouble with the Domain mapping plug in.

I have followed the instructions per and can't get the domain name that I have purchased to map. It always comes up with an error message.

I have added it as an add-on domain in CPANEL.

Could you please advise what I need to do to get it working.

When I log into the sub site (windsports) and go to tools/mapping and type in the custom domain, it always comes up with an error.

My webhost advises that the domain name is now propagated.