I set them both to t, now I have the following error on startup:

Debugger entered--Lisp error: (file-missing "make client process failed" "No such file or directory" :name "server-client-test" :family local :server nil :noquery t :service "/run/user/1000/emacs/server")
  make-network-process(:name "server-client-test" :family local :server nil :noquery t :service "/run/user/1000/emacs/server")
  server-running-p("server")
  server-start()
  eval-buffer(#<buffer  *load*> nil "/home/username/.emacs" nil t)  ; Reading at buffer position 27778
  load-with-code-conversion("/home/username/.emacs" "/home/username/.emacs" t t)
  load("~/.emacs" noerror nomessage)
  startup--load-user-init-file(#f(compiled-function () #<bytecode 0xed8d667e6160a0f>) #f(compiled-function () #<bytecode 0x81a386fa1b1b513>) t)
  command-line()
  normal-top-level()



Eli Zaretskii <eliz@gnu.org> ezt írta (időpont: 2020. okt. 12., H, 16:50):
> From: Michael Heerdegen <michael_heerdegen@web.de>
> Cc: Gábor <hajovonta@gmail.com>,  larsi@gnus.org,
>   npostavs@gmail.com,
>   43888@debbugs.gnu.org
> Date: Mon, 12 Oct 2020 07:58:27 +0200
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> > > *ERROR*: Wrong number of arguments: (1 . 4), 5
>
> > But since with "emacs -Q" it does work, it is still some of your
> > customizations that are the prime suspect.
>
> Is there a way for the user to get an error message more verbose than
> above?

Yes, make sure debug-on-signal and debug-on-error are both non-nil in
the Emacs that runs the server, then you will have the backtrace pop
up in Emacs.  Assuming there's some frame visible for the server, that
is.