From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dmitri Makarov <dmakarv@gmail.com>
Subject: graphviz dot block export and evaluate
Date: Fri, 28 Sep 2012 18:51:56 +0200
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To: "emacs-orgmode@gnu.org" <emacs-orgmode@gnu.org>

Hi all,

Has anyone successfully exported and evaluated src blocks with graphviz =
dot code?
I'm trying to export this block

   #+BEGIN_SRC dot :export both
     digraph G {
       A -> B
     }
   #+END_SRC

and I'm getting the error

org-babel-exp processing...
executing Dot code block...
file-name-extension: Wrong type argument: stringp, nil

How do you debug such problems?

Regards,

Dmitri