This client is too old to work with working copy

This client is too old to work with working copy

command list :

1.$ mkdir ./tmp_dir
2.$ svn co http://domain/path/to/svn ./tmp_dir

3.$ cd ./live_site
4.$ rm -rf `find . -type d -name .svn`

5.$ cd ../

6.$ rsync -auv ./tmp_dir/ ./live_site/

7.$ cd ./live_site
8.$ svn update

http://www.robsearles.com/2008/12/10/svn-client-is-too-old-to-work-with-working-copy-solution-using-rsync/