title: Emacs org-mode gnuplot : Error running timer: (void-variable data-file)
body: <p>Whenever I call the command <code>org-plot/gnuplot</code> in emacs org-mode,  I get the same error <code>Error running timer: (void-variable data-file)</code>. I am using emacs 24.4.1 in Debian Jessie as well as emacs 24.5 on a Mac Os.  Both systems have a working version of gnuplot. I even try this command when running emacs with no .emacs files and still get this same error. </p>