Hi Shahin,
when installing from the tarball, you should run
~$ make autoloads
or
~$ make
so that M-x org-version RET returns the correct version.
When installing from ELPA, you should do it from a fresh
emacs session.
Let me know if that helps,
--
Bastien
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