From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sebastien Vauban <sva-news-D0wtAvR13HarG/iDocfnWg@public.gmane.org>
Subject: Re: Cannot use unknown "latex" back-end
Date: Tue, 28 Apr 2015 10:20:26 +0200
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Hello Thomas,

Thomas S. Dye wrote:
> I pulled from master this morning, refreshed Org mode, and got this
> error message in *Messages*:
>
> Loading /Users/dk/.emacs.d/src/org-mode/contrib/lisp/ox-koma-letter.el (source)...
> org-export-register-backend: Cannot use unknown "latex" back-end as a parent

Don't you have, maybe, to add:

--8<---------------cut here---------------start------------->8---
  (add-to-list 'org-babel-load-languages '(latex . t))
--8<---------------cut here---------------end--------------->8---

Best regards,
  Seb

-- 
Sebastien Vauban