Fatal error: Class

Fatal error: Class 'Joomla\Registry\Registry' not found in /mounted-storage/home140/sub045/sc87832-MVMB/joomla/plugins/system/helix/core/classes/joomla30/helper.php on line 169

http://joomla.jesperaslund.se/

Anyone with a solution to this error?

Thanks alot!