From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Lawrence <richard.lawrence@berkeley.edu>
Subject: Re: Changed behaviours of LaTeX exporter in version 8.0+
Date: Thu, 18 Sep 2014 08:47:46 -0700
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To: emacs-orgmode@gnu.org
Cc: "Kyeong Soo (Joseph) Kim" <kyeongsoo.kim@gmail.com>

Hi Joseph,

"Kyeong Soo (Joseph) Kim" <kyeongsoo.kim@gmail.com> writes:

> I just found out that, if I close Emacs and relaunch it, all variables for
> filter (i.e., 'org-export-filter-*') are not defined. As a result, the
> following elisp codes for the workaround based on both your suggestion and
> the filter example in the manual causes void variable error (i.e.,
> "Symbol's value as variable is void:
> org-export-filter-special-block-function"):

Try adding:

(require 'ox)

before your filter definition.

Best,
Richard