I think this has to do with autoload, but I am not an emacs or org expert.

Try making sure that (package-initialize) comes before any org functions in
your .emacs (from the answer here
<http://stackoverflow.com/questions/17416738/emacs-initialization-as-org-file-how-can-i-get-the-right-version-of-org-mode>
).

HTH,
Jake


On Mon, Jun 9, 2014 at 1:18 AM, Shiyuan <gshy2014@gmail.com> wrote:

> Hi all,
>       I am using Emacs 24.3.9 + org-mode 8.2.6(from ELPA)
>       I followed this instruction
> http://orgmode.org/worg/org-contrib/babel/languages.html#configure
>
> and added the following to my .emacs file.
>
> (org-babel-do-load-languages
>   'org-babel-load-languages
>   '((python . t)
>     (emacs-lisp . t)))
>
> After that, org-mode mysteriously switched back to the old version 7.9.
>  Another problem is that export command C-c C-e no longer works and
> generates error: Symbol's function definition is void: org-defvaralias. Is
> there any step I missed? Thanks.
>
> Shiyuan
>
>
>
>