Comment 1 for bug 272425

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Jelmer Vernooij (jelmer) wrote : Re: bzr merge fails with message "different rich-root support"

You need to make sure both branches are using a rich-root-format. You can do this by upgrading both to the rich-root-pack format, e.g. "bzr upgrade --rich-root-pack bzr+ssh://<email address hidden>/%7Ebbs2ch-bot/bbs2ch/0.4-mirror", "bzr upgrade --rich-root-pack .".

The error message from bzr could perhaps be a bit clearer.