error when run: namespace_vcs_fix-7.1.jar

This is my first thread on this forum
first sorry my english is not that much good.
I am new to the WebMethod environment… and I need ur help…

I am trying to integrate (Plug-in) WebMethod with Subversion
following instructions listed in this link:

everything goes fine , but when I tried to run the update patch for integration server 7.1 ( namespace_vcs_fix-7.1.jar ) I got this error:

exception in thread “main” java.lang.noclassdeffounderror:com.wm.lang.ns.Namespace

I don’t know how to solve it ? any hint please…