[O] Help with error due to (require 'ox-beamer)?

[John Hendy]

Just pulled and with emacs -Q and then a minimal config loaded (just
setting org dirs), I've traced the problem down to =(require
'ox-beamer)=.

Min config:

;; set load dirs and global config options
(add-to-list 'load-path "~/.emacs.d/org.git/lisp")
(add-to-list 'load-path "~/.emacs.d/org.git/contrib/lisp")
(add-to-list 'load-path "~/.emacs.d/ess-12.04/lisp")
(add-to-list 'load-path "~/.emacs.d/site-lisp")

;; exporters
(require 'ox-beamer)

I get this error:

Problems while trying to load export back-end `icalendar'
org-export-barf-if-invalid-backend: Unknown "(quote latex)" back-end:
Aborting export

Not sure why it's trying to load icalendar?

This in Windows 7, git pull, and then make per the Worg instructions:

emacs -batch -Q -L lisp -l ../mk/org-fixup -f org-make-autoloads-compile


Thanks for any suggestions,
John