scalar operation,error

// Error: Cannot use data of type no type in a scalar operation

I got this error when i'm trying to open Render Settings
there is no settings in Metal Ray and sometimes in Maya Software.
you can choosee between MR and SW but you can not adjust any settings because there is no settings.

I tried to remoove my perfs. but it does not work.
I'm using maya 2008

anyone knows how to solve this problem.