Greetings to all,

this is my first post to the list. I am not sure if this is a bug or I
am doing something wrong config-wise.
I upgraded to emacs 24.5 (built from source on an Ubuntu 14.04.4 LTS)
just to have the functionality of gnus-icalendar and be able to save
calendar invitations from gnus to org files and view them in agenda.
My (relevant) config:

.emacs
...
(add-to-list 'auto-mode-alist '("\\.org\\'" . org-mode))
(setq org-directory "~/org/")
(setq org-agenda-files "calendar.org")
(setq org-agenda-archives-mode t)

.gnus.el
...
;; gnus icalendar handling
(require 'gnus-icalendar)
(gnus-icalendar-setup)
;; to enable optional iCalendar->Org sync functionality
;; NOTE: both the capture file and the headline(s) inside must already exist
(setq gnus-icalendar-org-capture-file "~/org/calendar.org")
(setq gnus-icalendar-org-capture-headline '("Calendar"))
(gnus-icalendar-org-setup)

Org file exists and has a 'Calendar' headline.
On export of a calendar mail (attached the calendar MIME part) I get the
attached backtrace. I get the same backtrace even when I send a gmail
calendar invitation. Any suggestions?

Regards,
Kostas

-- 
Kostas Zorbadelos	http://gr.linkedin.com/in/kzorba