dired-mark-unmarked-files failed with exceptions

[David Young]

Hi! Folks

I am running Emacs 23.3.1 on Ubuntu 12.04 32bit.  I tried to run `dired' on my Emacs extension directory and marked some files by `dired-mark-extension', and then I want to revert the mark and remove in-interesting file lines from the dired buffer, so I ran `dired-mark-unmarked-files' command, it failed with exceptions.  

Below is messages from the *Message* buffer.

For information about GNU Emacs and the GNU system, type C-h C-a.
Quit [2 times]
Making completion list...
Quit
Making completion list...

Loading dired-x...done
Marking matching files...
16 matching files marked.
call-interactively: Wrong number of arguments: #[(regexp msg &optional unflag-p localp) ("/usr/share/emacs/23.3/lisp/dired-x.elc" . 18095) nil 9 ("/usr/share/emacs/23.3/lisp/dired-x.elc" . 17750) "P"], 1

GNU Emacs 23.3.1 (i686-pc-linux-gnu, GTK+ Version 2.24.10) of 2012-03-26 on roseapple, modified by Debian

I enabled debug by  (toggle-debug-on-error) and ran the command `dired-mark-unmarked-files ' again. And the *Backtrace* buffer displayed following messages. 

Debugger entered--Lisp error: (wrong-number-of-arguments #[(regexp msg &optional unflag-p localp) ("/usr/share/emacs/23.3/lisp/dired-x.elc" . 18095) nil 9 ("/usr/share/emacs/23.3/lisp/dired-x.elc" . 17750) "P"] 1)

  dired-mark-unmarked-files(nil)
  call-interactively(dired-mark-unmarked-files t nil)
  execute-extended-command(nil)
  call-interactively(execute-extended-command nil nil)

It seems like that `dired-mark-unmarked-files ' would need some parameters but it is not provided.  Will anyone help me? Thanks a lot.

-- 
M-x Thinks