svn: This client is too old to work with working copy

svn: This client is too old to work with working copy

      [svn] svn: This client is too old to work with working copy 'D:\something'.  You need
      [svn] to get a newer Subversion client, or to downgrade this working copy.

      [svn] See http://subversion.tigris.org/faq.html#working-copy-format-change

      [svn] for details.
      [svn] <Update> failed !
     
      resolution:
     
      install cygwin
      install in cygwin vim, python
      get this script:
      http://svn.apache.org/repos/asf/subversion/trunk/tools/client-side/change-svn-wc-format.py
      in current directory of your project run: ./change-svn-wc-format.py . 1.5
      (that is if you wanted to update the version to 1.5 for 1.4 just type 1.4).