[cvsnt] how commit -r work?

[Elim]

I have a project in objC (like c/c++). and I want to make all the files to have revision number 2.0 (or 2.1) before I checkin big changes. I'm using win2k/cvsnt 2.5.03 at server side and the developer/client side is winxp / Cygwin / CVS 1.11.22.

It works fine so far for just check in and out the code / projects. But now I get problem to specify revision number for one of my projects.

F:\home\YL\Projects\wo\EObjects>cvs commit -m "make rev 2 before big changes" -r 2.0
cvs commit: Examining .
cvs server: nothing known about `2.0'
cvs server: nothing known about `--'
cvs [server aborted]: correct above errors first!

Any advices are greatly appreciated.