This client is too old to work with working copy

Question

Everywhere I go on google I get the same answer to this problem but it is the wrong answer for me. Originally I installed Subversion 1.5.6 for windows (i run Windows Server 2008

Answer 1

Check to see what svn command your post-commit hook script is running. Check that the version of this command matches the version of the last SVN client to touch your repository.

By default when using a new version of a subversion client it will upgrade the repository to that version. This means that suddenly older clients just stop working.