SVN Eclipse plugin error

ERROR:   

Unsupported working copyformat

svn: This clientis too old to work with working copy 'C:\workspace\active.com\explorer\info';please get a newer Subversion client

Reason:

You will get thiserror message once you have used a Subversion client linked with a higherSubversion version in workspace, and then try to execute a command with aSubversion client linked with an older version in Eclipse. e.g., you used an1.4.x client on your working copy, and now you try an svn 1.3.x client on thesame working copy.

The reason forthis is that Subversion 1.4 and 1.5 upgrade the working copies transparently onevery command. But once the working copy format is upgraded, older clientscan't access the working copy anymore because they don't know the new format.

Solution:

upgrade the SVNclient you use and that gave you this error message.
Or do a fresh checkout with the older client.