We\'re using an SVN repository. I am getting the error below when we try to compare a local unmodified file with the latest revision of the file in the repository. In other word
You probably don't have enough rights to read every file changed in those revisions. Hence, Subversion considers the revisions "unreadable" for you. This is explained in the authz_policy.txt document.
You have bad configuration (or Subversion has a bug:)).
Anyway it can be fixed by changing in "svnserve.conf" file the line:
[general]
anon-access = none
Another solution to change only "authz" file the line:
[/]
* = r
That solution is given anonymous reads your repository that is not good. If you need to use only authorization repository than use the first solution. (was tested with svn 1.6.17, but think it does not depend from version)