I had checked out a few files from the svn repository on an old machine, and then I moved the repository to a new server. I did not do a repo dump and move, just did a tar and scp and untar of the entire repository. When I try to check in to the new server [with the same hostname and same dir structure] it says:
svn: Commit failed (details follow):
svn: Server sent unexpected return value (500 Internal Server Error) in response to MKACTIVITY request for '/repos/papers/!svn/act/a49a699c-96a7-11df-9e8f-654930a0ec4e'