Exporting LaTeX

[Charles Howard <incubando@hotmail.co.uk>]

I am trying to implement a variation on what Russell Adams describes in

http://lists.gnu.org/archive/html/emacs-orgmode/2008-08/msg00044.html 

but I get the message 

>>>

An error has occurred while loading `/home/ogham/.emacs':

Symbol's value as variable is void: org-export-latex-classes

<<<

on starting emacs. The only way I could get C^c C^e l to write my preamble commands to file.tex
was by inserting my block of code

>>>
    ("myarticle"
     "\\documentclass[11pt]{article}
\\usepackage[utf8]{inputenc}
\\usepackage[T1]{fontenc}
\\usepackage{hyperref}
\\setlength{\\textwidth}{16cm}
\\setlength{\\textheight}{23cm}
\\setlength{\\voffset}{-1cm}
\\setlength{\\hoffset}{-1.5cm}
\\setlength{\\parindent}{0cm}
\\addtolength{\\parskip}{2mm}
\\usepackage{titlesec}
\\titleformat{\\section}[block]{\\bfseries}{\\S\\,\\thesection\\enspace}{.5em}{}
\\titleformat{\\subsection}[block]{\\mdseries}{\\thesubsection\\enspace}{.3em}{}
\\titleformat{\\subsubsection}[block]{\\mdseries}{{\\footnotesize\\thesubsubsection\\enspace}}{.1em}{\\footnotesize}"
     ("\\section{%s}" . "\\section*{%s}")
     ("\\subsection{%s}" . "\\subsection*{%s}")
     ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
     ("\\paragraph{%s}" . "\\paragraph*{%s}")
     ("\\subparagraph{%s}" . "\\subparagraph*{%s}"))
                                                                      
<<<

directly into /usr/local/share/emacs/site-lisp/org-export-latex.el 

Although this works for me, I'd still like to understand why the corresponding code into ~/.emacs did not work. 
Can someone tell me why this was so?

I'm using Orgmode 6.06b and emacs 22.1.1 on Ubuntu 7.10. 

Many thanks, Chas
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