PGP mail signing on the Mac

[Norman Walsh <ndw@nwalsh.com>]

Hi folks,

I have recently ported my config off a Linux box onto a Mac. I have
gpg installed, and I have previously had no difficulty with signing
mail, but today it goes bang.

I tried to walk my way backwards through the code, but I wasn’t
successful. I got as far as concluding that there’s some issue with
the context. But I could be wrong.

Anyone familiar with the code have a clue-by-four they can hit me
with?

Debugger entered--Lisp error: (wrong-type-argument char-or-string-p nil)
  mml1991-epg-sign((part (sign . "pgp") (tag-location . 334) (contents . "…")))
  mml1991-sign((part (sign . "pgp") (tag-location . 334) (contents . "…")))
  mml-pgp-sign-buffer((part (sign . "pgp") (tag-location . 334) (contents . "…")))
  mml-generate-mime-1((part (sign . "pgp") (tag-location . 334) (contents . "…")))
  mml-generate-mime()
  message-encode-message-body()
  message-send-mail(nil)
  message-send-via-mail(nil)
  message-send(nil)
  message-send-and-exit(nil)
  funcall-interactively(message-send-and-exit nil)
  call-interactively(message-send-and-exit nil nil)
  command-execute(message-send-and-exit)

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | Sun System & Network Admin manualIt is
http://nwalsh.com/            | important to realize that any lock can
                              | be picked with a big enough hammer.