At Tue, 19 Jul 2011 20:23:40 +0200,
suvayu ali wrote:
> 
> Hi David and Memnon,
> 
> Thank you for looking at this.
> 
> On Tue, Jul 19, 2011 at 7:53 PM, David Maus <dmaus@ictsoc.de> wrote:
> >> Debugger entered--Lisp error: (invalid-function org-loop-over-siblings-in-active-region)
> >>   org-loop-over-siblings-in-active-region("Scheduled to <2011-07-21 Thu>")
> >>   org-schedule(nil)
> >>   call-interactively(org-schedule nil nil)
> >
> > This looks like a macro problem. Could you try
> >
> > make clean
> > make
> >
> > and see if the problem still persists?
> >
> 
> That solved it! Just for the sake of understanding, what was most
> likely the issue here and what is a "macro problem"?

My diagnosis went like this:

(invalid-function org-loop-over-siblings-in-active-region)
 ^^^

Invalid function means that Emacs was not able to get a callable
function for the symbol named
'org-loop-over-siblings-in-active-region`

It tried to look up one, but failed[1]. 

'org-loop-over-siblings-in-active-region' is a macro (hence "macro
problem"). A macro is a Lisp structure that expands into Lisp code if
you compile (or run) a Lisp application.[2]

I suppose what happened was, that Emacs knew that loop-over-siblings is
a macro but got confused with the new .el and the old .elc files and
couldn't look up what the macro should expand into. Thus the invalid
function error.

The old .elc files were the issue.

Best,
  -- David

[1] See Emacs Elisp manual,
http://www.gnu.org/s/emacs/manual/html_node/elisp/Function-Indirection.html
[2] http://www.gigamonkeys.com/book/macros-defining-your-own.html

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