Newbie problems with mailcrypt

[Bill Harris <bill_harris@facilitatedsystems.com>]

I just installed mailcrypt 3.5.8 on gnus 5.9.0 under Emacs 21.2.1.  I
use Windows Privacy Tray 0.7.96 with its gpg installation (1.2.1).  

I made the following additions to my .emacs:

,----
| ;; Add mailcrypt 2004-03-28
| 
| 	(load-library "mailcrypt")
| 	(mc-setversion "gpg")
| 
| ;; Added according to http://www.suse.de/~garloff/Writings/mutt_gpg/node18.html  
| 
| (autoload 'mc-install-write-mode "mailcrypt" nil t)
| (autoload 'mc-install-read-mode "mailcrypt" nil t)
| (add-hook 'gnus-summary-mode-hook 'mc-install-read-mode)
| (add-hook 'message-mode-hook 'mc-install-write-mode)
| (add-hook 'news-reply-mode-hook 'mc-install-write-mode)
`----

I also modified mc-gpg.el:

,----
| ;; (defvar mc-gpg-path "gpg" "*The GPG executable.") ;;Customized 2004-03-28
| (defvar mc-gpg-path "gpg" "c:/Program Files/Windows Privacy Tools/GnuPG/gpg.exe")
| (defvar mc-gpg-alternate-keyring nil
|  "*Public keyring to use instead of default."
|  "c:/Documents and Settings/Bill Harris/Application Data/GnuPG");;added 2004-03-28
`----

When I restarted gnus, I indeed had a mailcrypt menu item.  When I try
to sign a message, I get

  Symbol's value as variable is void: <warner@lothar\.com>

I've obviously missed something, but I don't find anything about this
in the documentation I can find.  Any suggestions?

Thanks,

Bill