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The error message means that your host changed the absolute path to your site on their server. Many have as the real physical path something like /sites/site123/usr/www/ or something similar, but they hotlink the site123 to
http://www.yourname.com, making the path for you /sites/www.yourname.com/usr/www/. If they change site123 to siteabc, and change the hotlink accordingly, you won't notice the change (normally), but XOOPS has a built-in security check that looks for the real path the site is in.
The solution is this: ask your hosting company for the *real* physical path, without any hotlinked directories. Then your XOOPS site will work again
Herko