Legal folder names?

I'm having difficulty with merging a particular set of files. I get the message

svn: Working copy 'users/chris' not locked

I haven't been using chris's stuff in my working copy. Looking at his files
though I see he has a folders called

users\chris\dissertation\code\#Client
users\chris\dissertation\code\#Server

Could these be causing me problems on doing the merge? We mostly work on win32,
but the server is running freeBSD.

-- 
Robin Becker
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