From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Davis <pfd@pfdstudio.com>
Subject: Re: Can't email multipart/alternative anymore
Date: Fri, 23 Oct 2015 16:57:44 -0400
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References: <6sw6c7io5xg58k.fsf@pfdstudio.com> <87fv11zqej.fsf@gmail.com>
	<877fmdz567.fsf@nicolasgoaziou.fr>
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On 10/23/15 4:44 PM, Nicolas Goaziou wrote:
> Hello,
>
> Aaron Ecay <aaronecay@gmail.com> writes:
>
>> Based on the backtrace, I think that if you do M-x load-library RET
>> ox-org RET your error should disappear.
>>
>> If that’s the cause, the attached (draft) patch should give a better
>> error message in cases like this.
> Thank you.
>
> However, `org-export-barf-if-invalid-backend' raises an error, not
> a user-error. IOW, it doesn't need to be verbose: it is a bug if a user
> sees it anyway.

Actually, I didn't see the barf part in the mini-buffer. All I saw there 
was:

Unknown "nil" back-end: Aborting export


I copied the rest from *Messages*
> I suggest to (require 'ox-org) where appropriate and fix the issue.
> I didn't look closely at the problem so you know better than me where
> this line should be added.
I replied earlier, but it doesn't seem to have shown up on the list yet. 
Explicitly loading ox-org *did* fix the problem for me, but I already have

(require 'ox-org)

in my .emacs file, so I'm not sure why that was ineffective.

Thanks.
-pd