Hi,

I am also getting this error. It's fixable only by re-installing org from a
emacs -q, I assumed because files on the agenda file list are visited
before org is fully installed?
Unfortunately, this also occurs with a fresh install of Emacs
(re-installing all packages), but I'm not sure why. I'd assumed it's
because of the agenda file list, but that doesn't exist at that point.
I will try these days to get a minimal config to reproduce the issue, and
will respond again.

Best,
Tim

On Sun, Oct 3, 2021 at 5:37 AM Jarmo Hurri <jarmo.hurri@iki.fi> wrote:

>
> Ihor Radchenko <yantar92@gmail.com> writes:
>
> > Jarmo Hurri <jarmo.hurri@iki.fi> writes:
> >
> >> Greetings.
> >>
> >> I just installed (stable) 9.5. from GNU ELPA, and tried to see what my
> >> agenda for today looks like. The agenda is empty, and I got error
> >>
> >> Debugger entered--Lisp error: (invalid-function (date date))
> >>
> >> with backtrace
> >>
> >>   (date date)()
> >>   org-agenda-get-day-entries("/home/jarmo/projects/gtd/faq.org" (10
> >> 2 2021) :deadline :scheduled :timestamp :sexp)
> >
> > Looks like garbled installation.  Can you try to re-install Org?
>
> Hello Ihor.
>
> This morning the install instructions on orgmode.org had changed from
> yesterday: they now pointed to the manual, which contains the text
>
> Important: You need to do this in a session where no ‘.org’ file has
> been visited, i.e., where no Org built-in function have been
> loaded. Otherwise autoload Org functions will mess up the installation.
>
> I reinstalled from "emacs -q", and my error disappeared. So thank you
> very much.
>
> Have fun and stay safe.
>
> Jarmo
>
>
>