last (?) mailcrypt does not verify messages in INBOX

i downloaded and installed the last mailcrypt package (the son of mailcryptng) i have no previous experience with mailcrypt, when i try mc-verify from the INBOX summary to verify a signed message displayed in the INBOX buffer, an error is raised i have in my .emacs ------------------------------------------------------------------------ ;;; mailcrypt (load-library "mailcrypt") ; provides "mc-setversion" (mc-setversion "2.6") ; for PGP 2.6 (default); also "5.0" and "gpg" ;;; hooking into VM (add-hook 'vm-mode-hook 'mc-install-read-mode) (add-hook 'vm-summary-mode-hook 'mc-install-read-mode) (add-hook 'vm-virtual-mode-hook 'mc-install-read-mode) (add-hook 'vm-mail-mode-hook 'mc-install-write-mode) ;;; hooking into gnus/message (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) ------------------------------------------------------------------------ finally, this is the *Backtrace* buffer ------------------------------------------------------------------------ Signaling: (invalid-function (macro . #<compiled-function nil "...(2)" [(and vm-mail-buffer (or (buffer-name vm-mail-buffer) (error "Folder buffer has been killed.")) (set-buffer vm-mail-buffer))] 1>)) vm-select-folder-buffer() mc-vm-verify-signature() #<compiled-function nil "...(17)" [major-mode mc-modes-alist mode-alist verify mc-verify-signature func] 3 ("/usr/local/lib/xemacs/xemacs-packages/lisp/mailcrypt/mc-toplev.elc" . -5561) nil>() call-interactively(mc-verify) ------------------------------------------------------------------------ ah, the versions i use (insert (vm-version)) 6.71 (insert mc-version) 3.5.3 (insert emacs-version) 21.2 (beta15) "Sakuragawa" XEmacs Lucid % pgp Pretty Good Privacy(tm) 2.6.3i [...] thank you for any advice