Easypg with Gnus 5.11 Cannot find encrypt function

[Leo <sdl.web@gmail.com>]

Hi there,

I have installed easypg to my Emacs system. As indicated in README,
I have put (require 'epa-setup) and (setq mml2015-use 'epg) in my
~/.emacs.

Now I try to send an encrypted email in message-mode by 'C-c C-m C-c'
then 'C-c C-c' and this error occurs:

,----
| Debugger entered--Lisp error: (error "Cannot find encrypt function")
|   signal(error ("Cannot find encrypt function"))
|   error("Cannot find encrypt function")
|   mml2015-encrypt((part (encrypt . "pgpmime") (tag-location . 217) (contents . "encrypted\n")) nil)
|   mml-pgpmime-encrypt-buffer((part (encrypt . "pgpmime") (tag-location . 217) (contents . "encrypted\n")))
|   mml-generate-mime-1((part (encrypt . "pgpmime") (tag-location . 217) (contents . "encrypted\n")))
|   mml-generate-mime()
|   message-encode-message-body()
|   message-send-mail(nil)
|   message-send-via-mail(nil)
|   message-send(nil)
|   message-send-and-exit(nil)
|   call-interactively(message-send-and-exit)
`----

I'm using Gnus 5.11 (Emacs CVS: 2006-10-15)

Any ideas?

-- 
Leo