Problem after updating org: C-c a a broken

Problem after updating org: C-c a a broken

[Markus Heller]

Hello all,

just pulled from git.

When I type C-c a a to pull up the agenda, I get the error shown below.

This used to work prior to the update.

Org version is 7.7, pulled 5 min ago on emacs 23.3.1.

Help please, can't access my agenda anymore :(

Thanks
Markus

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  format(nil "COMMENT")
  (setq re (format org-heading-keyword-regexp-format org-comment-string))
  (save-excursion (remove-text-properties (point-min) (point-max) pall) (when org-agenda-skip-archived-trees (goto-char ...) (while ... ...)) (goto-char (point-min)) (setq re (format org-heading-keyword-regexp-format org-comment-string)) (while (re-search-forward re nil t) (add-text-properties ... ... pc)))
  (catch (quote nextfile) (if (bufferp file) (set-buffer file) (org-check-agenda-file file) (set-buffer ...)) (widen) (setq bmp (buffer-modified-p)) (org-refresh-category-properties) (setq org-todo-keywords-for-agenda (append org-todo-keywords-for-agenda org-todo-keywords-1)) (setq org-done-keywords-for-agenda (append org-done-keywords-for-agenda org-done-keywords)) (setq org-todo-keyword-alist-for-agenda (append org-todo-keyword-alist-for-agenda org-todo-key-alist)) (setq org-drawers-for-agenda (append org-drawers-for-agenda org-drawers)) (setq org-tag-alist-for-agenda (append org-tag-alist-for-agenda org-tag-alist)) (save-excursion (remove-text-properties ... ... pall) (when org-agenda-skip-archived-trees ... ...) (goto-char ...) (setq re ...) (while ... ...)) (set-buffer-modified-p bmp))
  (while (setq file (pop files)) (catch (quote nextfile) (if ... ... ... ...) (widen) (setq bmp ...) (org-refresh-category-properties) (setq org-todo-keywords-for-agenda ...) (setq org-done-keywords-for-agenda ...) (setq org-todo-keyword-alist-for-agenda ...) (setq org-drawers-for-agenda ...) (setq org-tag-alist-for-agenda ...) (save-excursion ... ... ... ... ...) (set-buffer-modified-p bmp)))
  (save-restriction (while (setq file ...) (catch ... ... ... ... ... ... ... ... ... ... ... ...)))
  (save-excursion (save-restriction (while ... ...)))
  (let ((pa ...) (pc ...) (pall ...) (inhibit-read-only t) (rea ...) bmp file re) (save-excursion (save-restriction ...)) (setq org-todo-keywords-for-agenda (org-uniquify org-todo-keywords-for-agenda)) (setq org-todo-keyword-alist-for-agenda (org-uniquify org-todo-keyword-alist-for-agenda) org-tag-alist-for-agenda (org-uniquify org-tag-alist-for-agenda)))
  org-prepare-agenda-buffers(("h:/org/NMR.org" "h:/org/Office.org" "h:/org/refile.org"))
  (if org-agenda-multi (progn (setq buffer-read-only nil) (goto-char ...) (unless ... ...) (narrow-to-region ... ...)) (org-agenda-reset-markers) (setq org-agenda-contributing-files nil) (setq org-agenda-columns-active nil) (org-prepare-agenda-buffers (org-agenda-files nil ...)) (setq org-todo-keywords-for-agenda (org-uniquify org-todo-keywords-for-agenda)) (setq org-done-keywords-for-agenda (org-uniquify org-done-keywords-for-agenda)) (setq org-drawers-for-agenda (org-uniquify org-drawers-for-agenda)) (let* (... ...) (cond ... ... ... ... ... ... ...) (unless ... ...)) (setq buffer-read-only nil) (let (...) (erase-buffer)) (org-agenda-mode) (and name (not org-agenda-name) (org-set-local ... name)))
  org-prepare-agenda("Day/Week")
  (let* ((span ...) (today ...) (sd ...) (ndays ...) (org-agenda-start-on-weekday ...) (thefiles ...) (files thefiles) (start ...) (day-numbers ...) (day-cnt 0) (inhibit-redisplay ...) s e rtn rtnall file date d start-pos end-pos todayp clocktable-start clocktable-end filter) (setq org-agenda-redo-command (list ... ... start-day ...)) (dotimes (n ...) (push ... day-numbers)) (setq day-numbers (nreverse day-numbers)) (setq clocktable-start (car day-numbers) clocktable-end (1+ ...)) (org-prepare-agenda "Day/Week") (org-set-local (quote org-starting-day) (car day-numbers)) (org-set-local (quote org-arg-loc) arg) (org-set-local (quote org-agenda-current-span) (org-agenda-ndays-to-span span)) (unless org-agenda-compact-blocks (let* ... ... ...) (add-text-properties s ... ...) (org-agenda-mark-header-line s)) (while (setq d ...) (setq date ... s ...) (if ... ... ...) (setq files thefiles rtnall nil) (while ... ...) (if org-agenda-include-diary ...) (if ... ...)) (when (and org-agenda-clockreport-mode clocktable-start) (let ... ... ... ... ... ... ... ...)) (goto-char (point-min)) (or org-agenda-multi (org-fit-agenda-window)) (unless (and ... ...) (goto-char ...) (recenter -1) (if ... ...)) (goto-char (or start-pos 1)) (add-text-properties (point-min) (point-max) (quote ...)) (if (eq org-agenda-show-log ...) (org-agenda-show-clocking-issues)) (org-finalize-agenda) (setq buffer-read-only t) (message ""))
  org-agenda-list(nil)
  call-interactively(org-agenda-list)
  (cond ((setq entry ...) (if ... ... ...)) ((equal keys "C") (setq org-agenda-custom-commands org-agenda-custom-commands-orig) (customize-variable ...)) ((equal keys "a") (call-interactively ...)) ((equal keys "s") (call-interactively ...)) ((equal keys "t") (call-interactively ...)) ((equal keys "T") (org-call-with-arg ... ...)) ((equal keys "m") (call-interactively ...)) ((equal keys "M") (org-call-with-arg ... ...)) ((equal keys "e") (call-interactively ...)) ((equal keys "?") (org-tags-view nil "+FLAGGED") (org-add-hook ... ... t t)) ((equal keys "L") (unless ... ...) (unless restriction ... ...)) ((equal keys "#") (call-interactively ...)) ((equal keys "/") (call-interactively ...)) ((equal keys "!") (customize-variable ...)) (t (error "Invalid agenda key")))
  (let* ((prefix-descriptions nil) (org-agenda-window-setup ...) (org-agenda-custom-commands-orig org-agenda-custom-commands) (org-agenda-custom-commands ...) (buf ...) (bfn ...) entry key type match lprops ans) (unless org-agenda-overriding-restriction (unless ... ...) (setq org-agenda-restrict nil) (move-marker org-agenda-restrict-begin nil) (move-marker org-agenda-restrict-end nil)) (put (quote org-agenda-redo-command) (quote org-lprops) nil) (put (quote org-agenda-redo-command) (quote last-args) nil) (setq org-agenda-last-dispatch-buffer (current-buffer)) (unless keys (setq ans ... keys ... restriction ...)) (when (and ... restriction) (put ... ... ...) (cond ... ...)) (cond (... ...) (... ... ...) (... ...) (... ...) (... ...) (... ...) (... ...) (... ...) (... ...) (... ... ...) (... ... ...) (... ...) (... ...) (... ...) (t ...)))
  (catch (quote exit) (let* (... ... ... ... ... ... entry key type match lprops ans) (unless org-agenda-overriding-restriction ... ... ... ...) (put ... ... nil) (put ... ... nil) (setq org-agenda-last-dispatch-buffer ...) (unless keys ...) (when ... ... ...) (cond ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...)))
  org-agenda(nil)
  call-interactively(org-agenda nil nil)

Re: Problem after updating org: C-c a a broken

[Nick Dokos]

Markus Heller <hellerm2@gmail.com> wrote:

> Hello all,
> 
> just pulled from git.
> 
> When I type C-c a a to pull up the agenda, I get the error shown below.
> 
> This used to work prior to the update.
> 
> Org version is 7.7, pulled 5 min ago on emacs 23.3.1.
> 
> Help please, can't access my agenda anymore :(
> 
> Thanks
> Markus
> 
> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>   format(nil "COMMENT")
>   (setq re (format org-heading-keyword-regexp-format org-comment-string))

I can't reproduce this: Org-mode version 7.7 (release_7.7.485.gcfed6.dirty)
(this is a pull from about 30mins ago plus Eric Schulte's code block keywords patch).

org-heading-keyword-regexp-format is initialized to nil and made
buffer-local in org.el It is set to a non-nil value in
org-set-regexps-and-options which is called from org-mode.  So if the
visited files's major mode is indeed org, I cannot imagine how this
error can come about.

What happens if you visit the three files in your agenda list and *then*
do C-c a a?  While visiting each file, do C-h v
org-heading-keyword-regexp-format RET and see if it is nil or not.

Nick

>   (save-excursion (remove-text-properties (point-min) (point-max) pall) (when org-agenda-skip-archived-trees (goto-char ...) (while ... ...)) (goto-char (point-min)) (setq re (format org-heading-keyword-regexp-format org-comment-string)) (while (re-search-forward re nil t) (add-text-properties ... ... pc)))
>   (catch (quote nextfile) (if (bufferp file) (set-buffer file) (org-check-agenda-file file) (set-buffer ...)) (widen) (setq bmp (buffer-modified-p)) (org-refresh-category-properties) (setq org-todo-keywords-for-agenda (append org-todo-keywords-for-agenda org-todo-keywords-1)) (setq org-done-keywords-for-agenda (append org-done-keywords-for-agenda org-done-keywords)) (setq org-todo-keyword-alist-for-agenda (append org-todo-keyword-alist-for-agenda org-todo-key-alist)) (setq org-drawers-for-agenda (append org-drawers-for-agenda org-drawers)) (setq org-tag-alist-for-agenda (append org-tag-alist-for-agenda org-tag-alist)) (save-excursion (remove-text-properties ... ... pall) (when org-agenda-skip-archived-trees ... ...) (goto-char ...) (setq re ...) (while ... ...)) (set-buffer-modified-p bm
 p))
>   (while (setq file (pop files)) (catch (quote nextfile) (if ... ... ... ...) (widen) (setq bmp ...) (org-refresh-category-properties) (setq org-todo-keywords-for-agenda ...) (setq org-done-keywords-for-agenda ...) (setq org-todo-keyword-alist-for-agenda ...) (setq org-drawers-for-agenda ...) (setq org-tag-alist-for-agenda ...) (save-excursion ... ... ... ... ...) (set-buffer-modified-p bmp)))
>   (save-restriction (while (setq file ...) (catch ... ... ... ... ... ... ... ... ... ... ... ...)))
>   (save-excursion (save-restriction (while ... ...)))
>   (let ((pa ...) (pc ...) (pall ...) (inhibit-read-only t) (rea ...) bmp file re) (save-excursion (save-restriction ...)) (setq org-todo-keywords-for-agenda (org-uniquify org-todo-keywords-for-agenda)) (setq org-todo-keyword-alist-for-agenda (org-uniquify org-todo-keyword-alist-for-agenda) org-tag-alist-for-agenda (org-uniquify org-tag-alist-for-agenda)))
>   org-prepare-agenda-buffers(("h:/org/NMR.org" "h:/org/Office.org" "h:/org/refile.org"))
>   (if org-agenda-multi (progn (setq buffer-read-only nil) (goto-char ...) (unless ... ...) (narrow-to-region ... ...)) (org-agenda-reset-markers) (setq org-agenda-contributing-files nil) (setq org-agenda-columns-active nil) (org-prepare-agenda-buffers (org-agenda-files nil ...)) (setq org-todo-keywords-for-agenda (org-uniquify org-todo-keywords-for-agenda)) (setq org-done-keywords-for-agenda (org-uniquify org-done-keywords-for-agenda)) (setq org-drawers-for-agenda (org-uniquify org-drawers-for-agenda)) (let* (... ...) (cond ... ... ... ... ... ... ...) (unless ... ...)) (setq buffer-read-only nil) (let (...) (erase-buffer)) (org-agenda-mode) (and name (not org-agenda-name) (org-set-local ... name)))
>   org-prepare-agenda("Day/Week")
>   (let* ((span ...) (today ...) (sd ...) (ndays ...) (org-agenda-start-on-weekday ...) (thefiles ...) (files thefiles) (start ...) (day-numbers ...) (day-cnt 0) (inhibit-redisplay ...) s e rtn rtnall file date d start-pos end-pos todayp clocktable-start clocktable-end filter) (setq org-agenda-redo-command (list ... ... start-day ...)) (dotimes (n ...) (push ... day-numbers)) (setq day-numbers (nreverse day-numbers)) (setq clocktable-start (car day-numbers) clocktable-end (1+ ...)) (org-prepare-agenda "Day/Week") (org-set-local (quote org-starting-day) (car day-numbers)) (org-set-local (quote org-arg-loc) arg) (org-set-local (quote org-agenda-current-span) (org-agenda-ndays-to-span span)) (unless org-agenda-compact-blocks (let* ... ... ...) (add-text-properties s ... ...) (org-agenda-mark
 -header-line s)) (while (setq d ...) (setq date ... s ...) (if ... ... ...) (setq files thefiles rtnall nil) (while ... ...) (if org-agenda-include-diary ...) (if ... ...)) (when (and org-ag
 enda-clockreport-mode clocktable-start) (let ... ... ... ... ... ... ... ...)) (goto-char (point-min)) (or org-agenda-multi (org-fit-agenda-window)) (unless (and ... ...) (goto-char ...) (recenter -1) (if ... ...)) (goto-char (or start-pos 1)) (add-text-properties (point-min) (point-max) (quote ...)) (if (eq org-agenda-show-log ...) (org-agenda-show-clocking-issues)) (org-finalize-agenda) (setq buffer-read-only t) (message ""))
>   org-agenda-list(nil)
>   call-interactively(org-agenda-list)
>   (cond ((setq entry ...) (if ... ... ...)) ((equal keys "C") (setq org-agenda-custom-commands org-agenda-custom-commands-orig) (customize-variable ...)) ((equal keys "a") (call-interactively ...)) ((equal keys "s") (call-interactively ...)) ((equal keys "t") (call-interactively ...)) ((equal keys "T") (org-call-with-arg ... ...)) ((equal keys "m") (call-interactively ...)) ((equal keys "M") (org-call-with-arg ... ...)) ((equal keys "e") (call-interactively ...)) ((equal keys "?") (org-tags-view nil "+FLAGGED") (org-add-hook ... ... t t)) ((equal keys "L") (unless ... ...) (unless restriction ... ...)) ((equal keys "#") (call-interactively ...)) ((equal keys "/") (call-interactively ...)) ((equal keys "!") (customize-variable ...)) (t (error "Invalid agenda key")))
>   (let* ((prefix-descriptions nil) (org-agenda-window-setup ...) (org-agenda-custom-commands-orig org-agenda-custom-commands) (org-agenda-custom-commands ...) (buf ...) (bfn ...) entry key type match lprops ans) (unless org-agenda-overriding-restriction (unless ... ...) (setq org-agenda-restrict nil) (move-marker org-agenda-restrict-begin nil) (move-marker org-agenda-restrict-end nil)) (put (quote org-agenda-redo-command) (quote org-lprops) nil) (put (quote org-agenda-redo-command) (quote last-args) nil) (setq org-agenda-last-dispatch-buffer (current-buffer)) (unless keys (setq ans ... keys ... restriction ...)) (when (and ... restriction) (put ... ... ...) (cond ... ...)) (cond (... ...) (... ... ...) (... ...) (... ...) (... ...) (... ...) (... ...) (... ...) (... ...) (... ... ...) (.
 .. ... ...) (... ...) (... ...) (... ...) (t ...)))
>   (catch (quote exit) (let* (... ... ... ... ... ... entry key type match lprops ans) (unless org-agenda-overriding-restriction ... ... ... ...) (put ... ... nil) (put ... ... nil) (setq org-agenda-last-dispatch-buffer ...) (unless keys ...) (when ... ... ...) (cond ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...)))
>   org-agenda(nil)
>   call-interactively(org-agenda nil nil)
> 
> 

Re: Problem after updating org: C-c a a broken

[Markus Heller]

Nick Dokos <nicholas.dokos@hp.com> writes:

> Markus Heller <hellerm2@gmail.com> wrote:
>
>> Hello all,
>> 
>> just pulled from git.
>> 
>> When I type C-c a a to pull up the agenda, I get the error shown below.
>> 
>> This used to work prior to the update.
>> 
>> Org version is 7.7, pulled 5 min ago on emacs 23.3.1.
>> 
>> Help please, can't access my agenda anymore :(
>> 
>> Thanks
>> Markus
>> 
>> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>>   format(nil "COMMENT")
>>   (setq re (format org-heading-keyword-regexp-format org-comment-string))
>
> I can't reproduce this: Org-mode version 7.7 (release_7.7.485.gcfed6.dirty)
> (this is a pull from about 30mins ago plus Eric Schulte's code block keywords patch).
>
> org-heading-keyword-regexp-format is initialized to nil and made
> buffer-local in org.el It is set to a non-nil value in
> org-set-regexps-and-options which is called from org-mode.  So if the
> visited files's major mode is indeed org, I cannot imagine how this
> error can come about.
>
> What happens if you visit the three files in your agenda list and *then*
> do C-c a a?  While visiting each file, do C-h v
> org-heading-keyword-regexp-format RET and see if it is nil or not.
>

Hi Nick,

I've visited all 3 agenda files.  C-c a a doesn't work in any of them,
and org-heading-keyword-regexp-format is NIL in all 3 of them.

Other thoughts?

Markus

Re: Problem after updating org: C-c a a broken

[Markus Heller]

Markus Heller <hellerm2@gmail.com> writes:

> Nick Dokos <nicholas.dokos@hp.com> writes:
>
>> Markus Heller <hellerm2@gmail.com> wrote:
>>
>>> Hello all,
>>> 
>>> just pulled from git.
>>> 
>>> When I type C-c a a to pull up the agenda, I get the error shown below.
>>> 
>>> This used to work prior to the update.
>>> 
>>> Org version is 7.7, pulled 5 min ago on emacs 23.3.1.
>>> 
>>> Help please, can't access my agenda anymore :(
>>> 
>>> Thanks
>>> Markus
>>> 
>>> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>>>   format(nil "COMMENT")
>>>   (setq re (format org-heading-keyword-regexp-format org-comment-string))
>>
>> I can't reproduce this: Org-mode version 7.7 (release_7.7.485.gcfed6.dirty)
>> (this is a pull from about 30mins ago plus Eric Schulte's code block keywords patch).
>>
>> org-heading-keyword-regexp-format is initialized to nil and made
>> buffer-local in org.el It is set to a non-nil value in
>> org-set-regexps-and-options which is called from org-mode.  So if the
>> visited files's major mode is indeed org, I cannot imagine how this
>> error can come about.
>>
>> What happens if you visit the three files in your agenda list and *then*
>> do C-c a a?  While visiting each file, do C-h v
>> org-heading-keyword-regexp-format RET and see if it is nil or not.
>>
>
> Hi Nick,
>
> I've visited all 3 agenda files.  C-c a a doesn't work in any of them,
> and org-heading-keyword-regexp-format is NIL in all 3 of them.
>
> Other thoughts?
>
> Markus

Hm, so ok, restarting emacs actually solved it.

Kinda weird, because I never had to do this when updating org (I don't
compile the sources, I just do C-c C-x !).

Seems a bit odd to me but it's working again so I'm happy :)

I apologize for the noise.

Re: Problem after updating org: C-c a a broken

[Nick Dokos]

Markus Heller <hellerm2@gmail.com> wrote:


> Hm, so ok, restarting emacs actually solved it.
> 
> Kinda weird, because I never had to do this when updating org (I don't
> compile the sources, I just do C-c C-x !).
> 
> Seems a bit odd to me but it's working again so I'm happy :)
> 
> I apologize for the noise.
> 
> 

Did you try M-x org-reload RET? That should work but sometimes it misses
something (but if it does, that would be a bug of course, so report it).

Re: Problem after updating org: C-c a a broken

[Nick Dokos]

Nick Dokos <nicholas.dokos@hp.com> wrote:

> Markus Heller <hellerm2@gmail.com> wrote:
> 
> 
> > Hm, so ok, restarting emacs actually solved it.
> > 
> > Kinda weird, because I never had to do this when updating org (I don't
> > compile the sources, I just do C-c C-x !).
> > 
> > Seems a bit odd to me but it's working again so I'm happy :)
> > 
> > I apologize for the noise.
> > 
> > 
> 
> Did you try M-x org-reload RET? That should work but sometimes it misses
> something (but if it does, that would be a bug of course, so report it).
> 
> 

nm - I missed the C-c C-x !

Re: Problem after updating org: C-c a a broken

[Sebastien Vauban]

Hi Nick and Markus,

Nick Dokos wrote:
> Nick Dokos <nicholas.dokos-VXdhtT5mjnY@public.gmane.org> wrote:
>> Markus Heller <hellerm2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> 
>> > Hm, so ok, restarting emacs actually solved it.
>> > 
>> > Kinda weird, because I never had to do this when updating org (I don't
>> > compile the sources, I just do C-c C-x !).
>> > 
>> > Seems a bit odd to me but it's working again so I'm happy :)
>> > 
>> > I apologize for the noise.
>> 
>> Did you try M-x org-reload RET? That should work but sometimes it misses
>> something (but if it does, that would be a bug of course, so report it).
>
> nm - I missed the C-c C-x !

I don't think org-reload is fully bullet-proof. I think it misses changes in
defvars, deffaces, and the like: once set, if the default is changed, it's not
updated by reloading the files.

Now, in 99.999% of the cases, that should not be a problem. But to be really
safe...

Last thing, how is this problem solved by a restart of Emacs and not by a
reload, not sure we can easily understand.

Best regards,
  Seb

-- 
Sebastien Vauban

Re: Problem after updating org: C-c a a broken

[Jinli]

Sebastien Vauban <wxhgmqzgwmuf@...> writes:

> 
> Hi Nick and Markus,
> 
> Nick Dokos wrote:
> > Nick Dokos <nicholas.dokos@...> wrote:
> >> Markus Heller <hellerm2@...> wrote:
> >> 
> >> > Hm, so ok, restarting emacs actually solved it.
> >> > 
> >> > Kinda weird, because I never had to do this when updating org (I don't
> >> > compile the sources, I just do C-c C-x !).
> >> > 
> >> > Seems a bit odd to me but it's working again so I'm happy :)
> >> > 
> >> > I apologize for the noise.
> >> 
> >> Did you try M-x org-reload RET? That should work but sometimes it misses
> >> something (but if it does, that would be a bug of course, so report it).
> >
> > nm - I missed the C-c C-x !
> 
> I don't think org-reload is fully bullet-proof. I think it misses changes in
> defvars, deffaces, and the like: once set, if the default is changed, it's not
> updated by reloading the files.
> 
> Now, in 99.999% of the cases, that should not be a problem. But to be really
> safe...
> 
> Last thing, how is this problem solved by a restart of Emacs and not by a
> reload, not sure we can easily understand.
> 
> Best regards,
>   Seb
> 

Hello 

I got similar errors while updating from org 7.3 to 7.8.08/09. My
emacs is 23.1. Open up emacs and type C-c a a will give an error about
function org-today is not defined. If I do an M-x org-version at this
stage it shows as the old 7.3 version. I have to manually do M-x
org-reload, which will bring up to 7.8 version.  And then everything
seems to function just fine.

Also sometimes emacs won't open org file by default if I do "emacs
$filename.org", again M-x org-reload will fix the issue. But it's
tedious as now I have to do 2 steps to open a file.

Can someone please advise what might be the problem here?

Thanks,
Jinli

Re: Problem after updating org: C-c a a broken

[Nick Dokos]

Markus Heller <hellerm2@gmail.com> wrote:

> Nick Dokos <nicholas.dokos@hp.com> writes:
> 
> > Markus Heller <hellerm2@gmail.com> wrote:
> >
> >> Hello all,
> >> 
> >> just pulled from git.
> >> 
> >> When I type C-c a a to pull up the agenda, I get the error shown below.
> >> 
> >> This used to work prior to the update.
> >> 
> >> Org version is 7.7, pulled 5 min ago on emacs 23.3.1.
> >> 
> >> Help please, can't access my agenda anymore :(
> >> 
> >> Thanks
> >> Markus
> >> 
> >> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
> >>   format(nil "COMMENT")
> >>   (setq re (format org-heading-keyword-regexp-format org-comment-string))
> >
> > I can't reproduce this: Org-mode version 7.7 (release_7.7.485.gcfed6.dirty)
> > (this is a pull from about 30mins ago plus Eric Schulte's code block keywords patch).
> >
> > org-heading-keyword-regexp-format is initialized to nil and made
> > buffer-local in org.el It is set to a non-nil value in
> > org-set-regexps-and-options which is called from org-mode.  So if the
> > visited files's major mode is indeed org, I cannot imagine how this
> > error can come about.
> >
> > What happens if you visit the three files in your agenda list and *then*
> > do C-c a a?  While visiting each file, do C-h v
> > org-heading-keyword-regexp-format RET and see if it is nil or not.
> >
> 
> Hi Nick,
> 
> I've visited all 3 agenda files.  C-c a a doesn't work in any of them,
> and org-heading-keyword-regexp-format is NIL in all 3 of them.
> 
> Other thoughts?
> 

Do C-h v major-mode RET  when you are visiting one of those files. What do you get?