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Hi Paulap,
This error message means that the physycal path is not the actual physical path of your site. Please verify with your hosting provider that the physical path does not contain any hotlinked directories, and that they give you the actual path. Many hosts use a hotlink to change site123 to yourname.com, so they can manage the site123 directories independant of the domain names. But XOOPS needs, as added protection, the real physical path.
If you have the real one, you can change mainfile.php and get on with the process.
Herko