Hi, first of all, please report your Org version with
M-x org-version RET
When installing from ELPA, you need to do it from a fresh Emacs
session, where Org has not been loaded yet.
Then, in your emacs.el, you need to call `package-initialize'
before any Org function is called:
(require 'package)
(setq package-archives
'(("org" . "http://orgmode.org/elpa/";)))
(package-initialize)
(require 'org)
Let us know how it goes,
--
Bastien
