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I'm guessing it wanted you to enable the "bookmarks" extension: I believe hg-git maps git branches to hg bookmarks.

edit: the "installing" section of http://hg-git.github.com/ confirms it.

Note that the installation instructions on that site are completely out of date. You don't need a C compiler anymore, just clone the repo and enable the extension, as described in the README: https://bitbucket.org/durin42/hg-git

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