WP MU error Warning: Creating default object from empty value in sunrise.php

I have a WordPress MU network with 4 sites working using their respective URL’s. I am trying to add a 5th site with the URL catalley.org. If you try to access catalley.org you can see the error messages.

A short history: The 4 original sites have been working for over a year and were originally set up using the WordPress MU Domain Mapping plugin. At this point the plugin is not activated and the sites are still working. I don’t understand that, but I reinstalled the plugin and moved the sunrise.php to wp-content and domain_mapping.php to mu-plugins. Somewhere along the line something did not get updated for the new site. The empty value in sunrise.php seems to be the key. WP and all plugins are the latest versions.

I don’t know if this is significant or not, but the 4 original site domains are registered with a different registrar. The new domain is registered with the same registrar as the hosting server. All 5 domains are parked.

How do I fix this without disturbing the other 4 network sites?