From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Schulte <schulte.eric@gmail.com>
Subject: Re: [babel] Error when exporting a trivial org file to HTML: Wrong
 type argument: stringp, (results . "")
Date: Thu, 29 Sep 2011 13:16:16 -0600
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	(Leo Alekseyev's message of "Thu, 29 Sep 2011 14:57:02 -0400")
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To: Leo Alekseyev <dnquark@gmail.com>
Cc: emacs-orgmode@gnu.org

Hi Leo,

On my system with the latest Org-mode I get the following slightly more
helpful error message.

  variable "foo" must be assigned a default value

Please add a default value to the foo variable for export and evaluation
of the code block to work.

Best -- Eric

Leo Alekseyev <dnquark@gmail.com> writes:

> Here is what's in my org file:
>
> ------------------------8<--------
> #+title:   My org file
> #+babel: :session *R-babel* :tangle yes
>
> * The problem
> ** The code
> This is going to fail on export:
>
> #+source: test_code
> #+BEGIN_SRC R :results output silent :exports none :var foo
>   bar <- foo
> #+END_SRC
>
> Why does this fail?
> #+call: test_code(foo=200)
> #+results: test_code(foo=200)
> ------------------------8<--------
>
> Simple, right?  Yet, when I try to do org-export-as-html, I get:
>
> executing R code block (test_code)...
> result is ""
> ""
> executing Emacs-Lisp code block...
>
> (results (quote ""))
>
> Code block produced no output.
> org-babel-exp-code: Wrong type argument: stringp, (results . "")
>
> This happens with the latest org-mode from trunk, as well as my
> few-months-old version.  What's going on?
>

-- 
Eric Schulte
http://cs.unm.edu/~eschulte/