Recently I was trying to commit to my Jango Desktop project hosted on Google code. I was using AnkhSVN and I kept getting an error similar to:

SharpSvn.SvnRepositoryIOException: Commit failed (details follow): ---> SharpSvn.SvnRepositoryIOException: Server sent unexpected return value (405 Method Not Allowed) in response to MKACTIVITY request for

If anyone else runs into this issue I was trying to commit to the read only repository. An easy way to tell if this is your issue is to look at the repository url. Google’s commit repository starts with https: // not http://

If this is your issue log into Google code to obtain the correct repository url.