This might happen for svn over ssh. After the subversion upgrade, we started to get

svn: No repository found in 'svn+ssh://...'

To fix this, go to the svn server, and do the following:

# cd /usr/bin
# ls -l svn*

If you don't see the soft link of svnserve linking to your customized "svnwrapper.sh" (or whatever file name you call it), then do this:

# mv svnserve svnserve-daemon
# ln -s /usr/local/bin/svnwrapper.sh svnserve

This should fix it.