I revcently upgraded from 1.1.8 to 220.127.116.11 and now I am getting the following error after logging into my admin area. I am also getting errors on the frontend side of things. Any ideas on what I should check.
Fatal error: Call to a member function getBackend() on a non-object in /app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php on line 379
Any help is greatly appreciated.