Error about TODO sequence states with 6.09 on Emacs 22.1.1

  Hi, I'm seeing a problem with TODO states in the latest org-mode version.

.emacs file to reproduce the bug::

---------
(add-to-list 'load-path "~/.emacs.d/org-6.09")
(require 'org)

 (add-to-list 'auto-mode-alist '("\\.org$" . org-mode))
 (define-key global-map "\C-ca" 'org-agenda)

(setq org-agenda-files (quote ("/tmp/test.org")))

(setq debug-on-error t)

(setq org-todo-keywords
      '( (sequence "START(s)" "|" "ENDED(e)")
         (sequence "TODO(t)" "|" "DONE(d)")) )
---------

The file /tmp/test.org must exist, but its content doesn't matter; it can be empty.

Sequence to reproduce the bug:

1. open emacs
2. C-c a a
3. You get this error:

Debugger entered--Lisp error: (wrong-type-argument stringp (sequence "START(s)" "|" "ENDED(e)"))
  regexp-quote((sequence "START(s)" "|" "ENDED(e)"))
  mapconcat(regexp-quote ((sequence "START(s)" "|" "ENDED(e)") (sequence "TODO(t)" "|" "DONE(d)")) "\\|")
  org-set-regexps-and-options()
  org-mode()
  set-auto-mode-0(org-mode nil)
  set-auto-mode()
  normal-mode(t)
  after-find-file(nil t)
  find-file-noselect-1(#<buffer test.org> "/tmp/test.org" nil nil "/home/tmp/test.org" (1391618 65024))
  find-file-noselect("/tmp/test.org")
  org-get-agenda-file-buffer("/tmp/test.org")
  org-prepare-agenda-buffers(("/tmp/test.org"))
  org-prepare-agenda()
  org-agenda-list(nil)
  call-interactively(org-agenda-list)
  byte-code(.....trimmed....)
  org-agenda(nil)
  call-interactively(org-agenda)

Versions:
GNU Emacs 22.1.1 (i486-pc-linux-gnu, GTK+ Version 2.12.9) of 2008-05-03 on terranova, modified by Ubuntu
org-mode 6.09

Thanks,

Daniel

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