An unknown Subversion error occurred. (code = 155037)

Suddenly my Mac Versions app starts to report "An unknown Subversion error occurred. (code = 155037)" when access SVN repository. This error is very generic and useless to help me troubleshoot the root cause.

Google took me to this blog
http://michaelwelburn.com/2013/08/08/error-code-155037-problem-switching-from-svn-1-6-17-to-1-7-8-on-os-x/

But I didn't update svn version or change Versions' settings, so I am thinking of other ways. Finally I figured out svn cleanup then svn update will help resolve this error.