Not for sure but may be this is a noob Question. If i want to change anything to the attributes sets in the attributes manager I get an empty page.
I tried to search in the log file and there is an error.
2014-08-23T11:34:48+00:00 ERR (3): Warning: include(): Failed opening 'Mage/Eav/Block/Adminhtml/Attribute/Grid/Abstract.php'
And I do not know how to fix this! Any tips or tricks for this one?