Error updating to latest version

I get the following error when I attempt to 'svn up' the subversion tree
from 4909 to HEAD(4914). It appears to be caused by something in the
libsvn_wc directory; can't tell what from the error message.
Transcript:

C:\Projects\subversion\subversion>svn info
Path:
Url: http://svn.collab.net/repos/svn/trunk/subversion
Revision: 4909
Node Kind: directory
Schedule: normal
Last Changed Author: striker
Last Changed Rev: 4908
Last Changed Date: 2003-02-16 11:48:10 +1300 (Sun, 16 Feb 2003)
Properties Last Updated: 2003-01-21 13:21:48 +1300 (Tue, 21 Jan 2003)

C:\Projects\subversion\subversion>svn up
svn: Svndiff data has invalid header
svn: svndiff has invalid header

C:\Projects\subversion\subversion>svn --version
svn, version 0.17.1 (dev build)
   compiled Feb 4 2003, 10:14:04

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Received on Mon Feb 17 22:19:49 2003