Yes. Putting (package-initialize) immediately before the
(org-babel-do-load-languages
...) solves the problem.



On Mon, Jun 9, 2014 at 7:54 AM, Jorge A. Alfaro-Murillo <
jorge.a.alfaro@gmail.com> wrote:

> Shiyuan <gshy2014@gmail.com> writes:
>
> > 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
>
> Hi Shiyuan,
>
> Have you tried to put (package-initialize) early (say first line) in
> your .emacs?
>
> Best,
>
> Jorge.
>
>
>