Looks like it is a bug? Why it is not loaded automatically while 8.2 has no
issue?

On Wed, Jan 18, 2017 at 12:56 PM, Charles C. Berry <ccberry@ucsd.edu> wrote:

> On Wed, 18 Jan 2017, Young-whan wrote:
>
> I've installed the emacs-app via port, and there was no problem with Latex
>> Preview Fragment in a buffer at all.
>>
>> Now, using the M-x package-list-packages, I've installed the latest org
>> 9.0.3, then the latex preview is not working at all.
>>
>> It comes with following error:
>>
>> org-create-formula--latex-header: Symbol’s function definition is void:
>> org-export-get-backendError during redisplay: (eval (mode-line-mode-name))
>> signaled (void-function mode-line-mode-name)
>>
>
> That is because `org-export-get-backend' is not loaded (nor autoloaded).
>
> You can type C-c C-e q to force loading of the org-export-* functions. Or
> put (require 'ox) in your init file.
>
> I don't see why `org-export-get-backend' is lacking an autoload directive.
>
> Bug??
>
> Chuck
>