This client is too old to work with working copy

ever seen this beautiful message?

svn: This client is too old to work with working copy '.'. You need
to get a newer Subversion client, or to downgrade this working copy.
See http://subversion.tigris.org/faq.html#working-copy-format-change
for details.


very short solution :

download that piece of code, then on a console run

python change-svn-wc-format.py /projectfoldertodowngrade/ --force --verbose 1.5 (if 1.5 is the version you wish to downgrade to).