Symbol's function definition is void: dired-omit-mode

[John J. Lee]

Switching to emacs 22 recently, I'm getting this when using C-x d to
visit a directory using dired-x.

Symbol's function definition is void: dired-omit-mode


The emacs 22 info pages seem quite clear that what I'm doing should
work -- in fact, I copied my dired-mode-hook code straight from the
info pages.  Here's the relevant chunk from my .emacs:


(add-hook 'dired-load-hook
      (function (lambda ()
            (load "dired-x")
            (setq dired-omit-files
                  (concat dired-omit-files "\\|^CVS$\\|^.cvsignore$"))
            (setq dired-omit-files
                  (concat dired-omit-files "\\|\\.pyc$\\|\\.pyo$|\\.pyw$"))
            (setq dired-omit-files
                  (concat dired-omit-files 
"\\|\\.o$\\|\\.so\\|\\.a\\|\\.lo\\|\\.la$"))
            )))
(add-hook 'dired-mode-hook
          (lambda ()
            ;; Set dired-x buffer-local variables here.  For example:
            (dired-omit-mode 1)
            ))


Help!


John