I'm just a Prolog beginner, but this:

#+begin_src prolog
edge(a,b).
edge(a,e).
edge(b,d).
edge(b,c).
edge(c,a).
edge(e,b).
tedge(Node1,Node2) :-
        edge(Node1,SomeNode),
        edge(SomeNode,Node2).
#+end_src

keeps giving me this:

executing Prolog code block...
executing Prolog source code block
org-babel-execute:prolog: Wrong type argument: char-or-string-p, ni

BTW, should it be

(eval-after-load 'org
  '(require 'ob-prolog))

or

(eval-after-load "org"
  '(require 'ob-prolog))

. . . org in quotes?

On Thu, May 14, 2015 at 5:03 PM, Bjarte Johansen <
bjarte.johan...@infomedia.uib.no> wrote:

>
> > On 14 May 2015, at 20:22, Puneeth Chaganti <puncha...@gmail.com> wrote:
> >
> > On Thu, May 14, 2015 at 11:41 PM, Lawrence Bottorff <borg...@gmail.com>
> wrote:
> >>
> >> Confused by the requirement:
> >>
> >> ;; To activate ob-prolog add the following to your init.el file:
> >> ;;
> >> ;;  (eval-after-load 'org
> >> ;;    '(require 'org-prolog))
> >
> >
> > I'm guessing its a typo and should be ob-prolog. The file provides
> ob-prolog.
>
> Yes, I typed it wrong. Thank you for bringing it to my attention. I also
> discovered that it is better to use `org-babel-do-load-languages’ instead
> as well. I will change the recommendation tomorrow.
>
> Regards,
> Bjarte

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