I have a lot of changes in a working folder, and something screwed up trying to do an update.
Now when I issue an \'svn cleanup\' I get:
>svn clea
After going through most of the solutions that are cited here, I still was getting the error.
The issue was case insensitive OS X. Checking out a directory that has two files with the same name, but different capitalization causes an issue. For example, ApproximationTest.java and Approximationtest.java should not be in the same directory. As soon as we get rid of one of the file, the issue goes away.