The problem is that you had the domain added as "Addon domain".
Before changing your main domain you should have removed this addon domain.
I've done this for you and set: boldbux.info as your main domain. It should work now.
EDIT: I see you have an CMS, and that's why it's showing domain available for you, as your CMS is trying to use the previous URL that you had, the x10hosting subdomain. You should be able to change this on the configuration file of your CMS, or at the database.