Error when printing with muttprint

[Glyn Millington]

Can anyone tell me what is happening here? When I use the menu item for
printing with muttprint I get the following error, though the printing
itelf works nicely!!

Xemacs 21.4.17, Gnus 5.10.7 on Linux

Thanks in advance for any light you can shed!

atb 

Glyn



Debugger entered--Lisp error: (wrong-type-argument number-char-or-marker-p t)
  =(0 t)
  (if (= 0 (shell-command-on-region ... ... muttprint-command nil)) (message 
"article printed with muttprint"))
  (save-restriction (widen) (if (= 0 ...) (message "article printed with 
muttprint")))
  (progn (if w (progn ... ...) (pop-to-buffer buf)) (save-restriction (widen) 
(if ... ...)))
  (unwind-protect (progn (if w ... ...) (save-restriction ... ...)) 
(select-window GnusStartBufferWindow))
  (let* ((GnusStartBufferWindow ...) (buf gnus-article-buffer) (w ...)) 
(unwind-protect (progn ... ...) (select-window GnusStartBufferWindow)))
  (gnus-eval-in-buffer-window gnus-article-buffer (save-restriction (widen) (if 
... ...)))
  gnus-summary-pipe-to-muttprint(nil)
  byte-code("..." [gnus-save-article-buffer save-buffer gnus-article-buffer 
filename gnus-default-article-saver gnus-prompt-before-saving error "No default 
saver is defined" default always t file num gnus-number-of-articles-to-be-saved 
gnus-article-current-summary] 2)
  gnus-article-save(#<buffer " *Gnus Save*"> nil 1)
  gnus-summary-save-article(nil t)
  gnus-summary-muttprint(nil)
  call-interactively(gnus-summary-muttprint)