From mboxrd@z Thu Jan  1 00:00:00 1970
From: Noorul Islam <noorul@noorul.com>
Subject: Re: Unable to quit emacs after enabling Clocking
Date: Sun, 24 Oct 2010 09:17:23 +0530
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To: mwnn <mwnnlin@gmail.com>
Cc: "emacs-orgmode@gnu.org" <emacs-orgmode@gnu.org>

On Sun, Oct 24, 2010 at 8:54 AM, mwnn <mwnnlin@gmail.com> wrote:
> The call trace is as shown below:
>
> Debugger entered--Lisp error: (wrong-type-argument stringp (".~"))
> =A0expand-file-name((".~") "/home/mwnn/.emacs.d/")
> =A0make-backup-file-name-1("/home/mwnn/.emacs.d/org-clock-save.el")
> =A0find-backup-file-name("/home/mwnn/.emacs.d/org-clock-save.el")
> =A0backup-buffer()
> =A0basic-save-buffer-2()
> =A0basic-save-buffer-1()
> =A0basic-save-buffer()
> =A0save-buffer()
> =A0org-clock-save()
> =A0run-hooks(kill-emacs-hook)
> =A0kill-emacs()
> =A0save-buffers-kill-emacs(nil)
> =A0save-buffers-kill-terminal(nil)
> =A0call-interactively(save-buffers-kill-terminal nil nil)
>

What is the value of backup-directory-alist?

C-h v backup-directory-alist

I think it should be an alist.

Thanks and Regards
Noorul