I'm trying to get to know Mercurial, so I can start a bit of open source development. But since I'm not very experienced either with programming, Mercurial or Python, I'm quite stuck.. I've installed the newest version of Mercurial, but whenever I try to do anything in the terminal with hg, then I get the same error, as follows: The Mercurial install is standard, and I have not installed anything else. I've checked that Python 2.6 is installed, and I've also tried installing both Xcode 3 and 4. I'm running OSX 10.6.7. Any suggestions?