[TxMt] Mercurial bundle - abort: There is no Mercurial repository here (.hg not found)!

I've recently starting using mercurial (using v0.9.5), and am using the Mercurial bundle (2 Aug 2007 version - the latest, I think). Sometimes it works great, and sometimes an attempt to use it fails with "abort: There is no Mercurial repository here (.hg not found)!". I've searched the list archives, and found one reference to this issue:

http://lists.macromates.com/pipermail/textmate/2007-November/023219.html

But I don't understand the discussion, nor how to apply it to my project. How can I create a TextMate project that has files from several different nested directories, without having the Mercurial bundle fail to work?

Thanks,

-- Kevin Horton Ottawa, Canada