One week ago I installed org-drill using the last version of org-mode
(tarball version) and everythings were fine.
A few days later I tried to install it using elpa (since it's easier to be
update). But after installation I was getting this error:

Making completion list...
Collecting due drill items:   0 |.......................................
Creating unique IDs for items (slow, but only happens once)
mapcar: Wrong type argument: listp, \.\.\.

After a lot o tries to solve this problem I decided to back to old approach
and using the  tarball version. I added this package to the load path and
as you are seeing bellow this package is shadowed the default version of
emacs:

~/.emacs.d/thirdparty/org/lisp/org-bibtex hides
/usr/share/emacs/24.3/lisp/org/org-bibtex
~/.emacs.d/thirdparty/org/lisp/org-capture hides
/usr/share/emacs/24.3/lisp/org/org-capture
~/.emacs.d/thirdparty/org/lisp/ob-io hides
/usr/share/emacs/24.3/lisp/org/ob-io
...

Since I downloaded the tarball named org-8.2.5h.tar.gz I suppose executing
M-x org-version I have to get version 8.2.5 of org-mode, but this is what
I'm getting:

Org-mode version 7.9.3f (release_7.9.3f-17-g7524ef @
/home/shahin/.emacs.d/thirdparty/org/lisp/)

I'll be happy if someone help me to solve this problem. org-drill is
awesome and I really need it.

Kindly.

-- 
*Shahin Azad!*
My personal *blog*: http://shahinism.github.io
I like to keep it respectful with *OpenRespect* (http://www.openrespect.org)