Rake Problems

I have been trying to create a Gem package for Rcss. For some reason Rake dies complaining that:

no such option: noop

It almost certainly is my fault (as Google is not aware of such error) but I can not pinpoint it. I just hate wasting time solving that kind of problems.

Update

Found the problem. Gem task executes properly, only package has problems. Gem can be successfully built, but I wonder what is broken in other types of packages?