Hi Chris,

I would try Eric's suggestion of making sure you have all the correct
"require" statements in your .emacs file.  If that doesn't work, make sure
you have a recent version of =org-mode= --- I've run into this problem in
the past, even with the appropriate "require"s, but with an old version of
=org-mode=.

Chris

On Mon, Mar 28, 2011 at 8:05 AM, Eric S Fraga <e.fraga@ucl.ac.uk> wrote:

> Chris Beard <wcbeard10@wabash.edu> writes:
>
> > Hello,
> > I've tried to modify some default latex export settings based on info
> from here
> > http://www.mail-archive.com/emacs-orgmode@gnu.org/msg07645.html
> >
> > I basically add to the org-mode-hook to do:
> > (setq org-export-latex-classes (cons '("myarticle"
> >                                          "% BEGIN My Article Defaults
> >   \\documentclass[10pt,letterpaper]{article}
> >
> >
> \\usepackage[letterpaper,includeheadfoot,top=0.5in,bottom=0.5in,left=0.75in,right=0.75in]{geometry};;
> > more settings after this...
> >     )
> >                                        org-export-latex-classes))
> >
> > This works if I evaluate it after I've been exporting to latex, but I
> > get an error whenever I start up emacs:
> >
> > setq: Symbol's value as variable is void: org-export-latex-classes
> >
> > I'm guessing there's some org-mode latex-export thing that I need to
> > load first, but I'm not very familiar with how to do this. Any advice?
> >
> > Thank you
> > Chris
>
> I have:
>
> --8<---------------cut here---------------start------------->8---
> (require 'org-install)
> (require 'org-exp)
> (require 'org-atom)
> (require 'org-exp-bibtex)
> (require 'org-latex)
> --8<---------------cut here---------------end--------------->8---
>
> before any customisations.
>
> By the way, for the types of customisation you are doing above
> (obviously, I don't know what you have omitted), I find it easier to
> define an org template that has the appropriate #+LaTeX_CLASS_OPTIONS
> and #+LATEX_HEADER lines.
> --
> : Eric S Fraga (GnuPG: 0xC89193D8FFFCF67D) in Emacs 24.0.50.1
> : using Org-mode version 7.5 (release_7.5.115.g00134.dirty)
>
>