svn: This client is too old to work with working copy;I check my svn version and I was running 126.96.36.199521. I downloaded the client from the CollabNet website http://www.open.collab.net/downloads/subversion/ and installed it. At the installer I had to change the install path to match my old installation folder(C:\Program Files\Subversion).
please get a newer Subversion client
After upgrading to svn version 1.5 i was able to run the plug-in update without any errors.