Error: 175002 (RA layer request failed)

I get the following error when connecting XCode to a repository on GoogleCode.com

Error: 175002 (RA layer request failed) Description: Server sent unexpected retur开发者_如何转开发n value (405 Method Not Allowed) in response to OPTIONS request for 'http://touchcode.googlecode.com/hg' 

Has anyone see this before and how do I resolve it?

If you are using http protocol for accessing svn , try using svn://repoaddress/

In my case the protocol was incorrect.

That's a Mercurial repository. You can't use Subversion (or Xcode's Subversion integration, which counts as the same thing) to access a Mercurial repository.

Xcode has no Mercurial integration, so you are just going to have to clone the repository outside of Xcode, using either Mercurial directly or a GUI Mercurial client such as Murky or MacHg.