Hello Bastien, 

org-version returns:

Org-mode version 8.2.6 (8.2.6-6-gfc37d1-elpa 


On Sunday, 27 July 2014 at 12:29, Bastien wrote:

> Hi Hassan,
> 
> > I am running Mac OS X 10.8 (Mountain Lion) and emacs 24.3.
> 
> What is your Org version?
> 
> Please report what M-x org-version RET says.
> 
> Thanks,
> 
> -- 
> Bastien