Error on opening org file

Error on opening org file

[RC]

Hi,
 I am running Emacs 23.1 in Windows Vista. I did a git upgrade on org-mode today
and when I open a org file I get the error shown below and it defaults to
fundamental mode. I had the same problem with Emacs 23.0.92, which was working
fine with org-mode until I did the git update. I would appreciate any
suggestions to fix the problem.
RC
Debugger entered--Lisp error: (setting-constant nil)
  set(nil (keymap "Sun/Moon" (Lunar\ Phases menu-item "Lunar Phases"
calendar-lunar-phases) (Sunrise/sunset\ for\ cursor\ date menu-item
"Sunrise/sunset for cursor date" calendar-sunrise-sunset) (Sunrise/sunset\ for\
cursor\ month menu-item "Sunrise/sunset for cursor month"
calendar-sunrise-sunset-month)))
  (let ((keymap ...)) (set symbol keymap) (fset symbol (\` ...)) (mapcar (lambda
... ...) (if ... ... maps)))
  easy-menu-do-define(nil (keymap #^[nil nil keymap 
#^^[3 0 calendar-set-mark calendar-beginning-of-week calendar-backward-day ...
nil calendar-end-of-week calendar-forward-day nil nil nil nil nil nil nil
calendar-forward-week nil calendar-backward-week nil nil nil nil nil
calendar-scroll-left-three-months nil ... nil nil ... nil nil nil nil
scroll-other-window nil nil nil nil nil nil nil nil nil nil nil nil
negative-argument calendar-goto-today nil ...] #^^[1 0 #^^[2 0 
#^^[3 0 calendar-set-mark calendar-beginning-of-week calendar-backward-day ...
nil calendar-end-of-week calendar-forward-day nil nil nil nil nil nil nil
calendar-forward-week nil calendar-backward-week nil nil nil nil nil
calendar-scroll-left-three-months nil ... nil nil ... nil nil nil nil
scroll-other-window nil nil nil nil nil nil nil nil nil nil nil nil
negative-argument calendar-goto-today nil ...] nil nil nil nil nil nil nil nil
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
nil nil nil] nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil] nil
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
nil nil nil nil ...] (menu-bar keymap (search . undefined) (edit . undefined))
(67108896 . calendar-set-mark) (down . calendar-forward-week) (right .
calendar-forward-day) (up . calendar-backward-week) (left .
calendar-backward-day) (next . calendar-scroll-left-three-months) (prior .
calendar-scroll-right-three-months) (remap keymap (write-region .
calendar-not-implemented) (capitalize-region . calendar-not-implemented)
(copy-region-as-kill . calendar-not-implemented) (kill-region .
calendar-not-implemented) (upcase-region . calendar-not-implemented)
(downcase-region . calendar-not-implemented) (mark-page .
calendar-not-implemented) (mark-whole-buffer . calendar-not-implemented)
(mark-defun . calendar-not-implemented) (mark-paragraph .
calendar-not-implemented) (mark-sexp . calendar-not-implemented) (mark-word .
calendar-not-implemented) (narrow-to-region . calendar-not-implemented)
(self-insert-command . undefined))) nil ("Sun/Moon" ["Lunar Phases"
calendar-lunar-phases] ["Sunrise/sunset for cursor date"
calendar-sunrise-sunset] ["Sunrise/sunset for cursor month"
calendar-sunrise-sunset-month]))