Joomla error on user logout help needed ASAP!

I've built a new Joomla 2.5 website in a sub domain. Everything works fine but now that the site has been moved to the root domain I get the following error when I try to log out with a user account Fatal error: Call to a member function init() on a non-object in /directory/templates/rt_clarion/[login to view URL] on line 20 This happens with multiple users. I've tested it logging out with the Joomla login and I get the above error. Logging out under my Kunena forum I get a generic 500 error. I need this fixed ASAP my site launch is on hold until this is fixed. Please only bid if you can work on this immediately!