Alright, I fixed the error:
Warning: constant() [function.constant]: Couldn’t find constant VHOST in /home2/stoprepr/public_html/wp-content/plugins/wordpress-mu-domain-mapping/domain_mapping.php on line 30
Fatal error: Call to undefined function is_site_admin() in /home2/stoprepr/public_html/wp-content/plugins/wordpress-mu-domain-mapping/domain_mapping.php on line 33
… by deleting the files on my host site.
But, can anyone give some insight on how to get my domain page to stop giving the error:
The page isn’t redirecting properly
Firefox has detected that the server is redirecting the request for this address in a way that will never complete.
* This problem can sometimes be caused by disabling or refusing to accept
cookies.
Again, thanks