We have updated an older site to a new version of Magento and given it a new look. It is live and everything is working except I can't change any user roles. When I go into System->Permissions->Roles->Add role (or click on an existing role) I get a blank screen. If I turn php errors on in index.php file I get the following error:
Fatal error: Class 'Mage_Adminfee_Helper_Data' not found in /home/sites/website/public_html/app/Mage.php on line 547
And in the system log it shows this error:
Warning: include(Mage/Adminfee/Helper/Data.php): failed to open stream: No such file or directory in /home/sites/gwebsite/public_html/lib/Varien/Autoload.php on line 93
Any advice would be appreciated.