debbugs-el not working

["Jens Müller" <jens@unfaehig.de>]

When I do
M-x debian-bug,
then enter j2re1.3, normal and "test"
 (or anything else, doesn't matter),
I get
Signaling: (void-function mail-header-end)
  mail-header-end()
  #<compiled-function nil "...(191)" [debian-bug-packages-obarray
  debian-bug-From-address debian-bug-mail-address severity subject
  package completing-read "Package name: "
  debian-bug-fill-packages-obarray nil current-word "wnpp"
  debian-bug-wnpp intern-soft y-or-n-p "Package does not appear to be
  installed. Continue? " error "Quitting." "Severity (default normal):
  " t "normal" read-string "(Very) brief summary of problem: " require
  reporter reporter-compose-outgoing gnus-user-agent buffer-name "
  *nntpd*" "*mail*" re-search-forward "To:" " " "To: " "Subject:" ": "
  "Subject: " sendmail mail-header-end 1 message "Getting package
  information from system..." debian-bug-prefill-report "Getting
  package information from system...done" "From: " "\n"
  debian-bug--set-X-Debbugs-CC set-window-start selected-window
  debian-bug-minor-mode ...] 9
  ("/usr/share/xemacs21/site-lisp/debbugs-el/debian-bug.elc" . 13175)
  nil>()
  call-interactively(debian-bug)
  command-execute(debian-bug t)
  execute-extended-command(nil)
  call-interactively(execute-extended-command)

Any clue someone?