Madhav,
I agree with Vadim ... 100 formulas are not much. I know upgrading BPC on the server side is not a simple task and requires some coordination, the EPM Add-in upgrade should be fairly easy. Before you try upgrading, it might be worth checking out some notes like 2085520.
Hope this helps, sorry for the vague answer but the #RFR errors are not super specific either and can be caused by a host of things.
Akos