How do I get around this error?
Edit: I'm using the latest version of C2, r236.
Edit2: Good news! It's working now, after a computer restart. It looks like the error involved may be able to be fixed after a C2 restart or a full computer restart. So if anyone else gets this error, try to restart C2 or restart the computer itself. My guess is that restarting C2 should be sufficient.