From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Dokos <ndokos@gmail.com>
Subject: Re: Can't email multipart/alternative anymore
Date: Thu, 22 Oct 2015 17:20:19 -0400
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Peter Davis <pfd@pfdstudio.com> writes:

> I just tried running org-mime-org-buffer-htmlize, which I have used
> successfully in the past. However, this time, I got an empty
> message buffer, and this in the mini-buffer:
>
> org-export-barf-if-invalid-backend: Unknown "nil" back-end: Aborting export
>
> Any clues? I haven't used this in a couple of months, but it did work
> at one time and, as far as I know, I haven't changed anything
> that should impact this.
>

Works here: Org-mode version 8.3.2 (release_8.3.2-178-g96681f @
/home/nick/elisp/org-mode/lisp/)

Maybe set debug-on-error and try again - send the backtrace if
you get one. Or maybe try with -q, load a minimal .emacs with
org and org-mime and try that.

--
Nick