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 08:51:31 +0530
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To: mwnn <mwnnlin@gmail.com>
Cc: "emacs-orgmode@gnu.org" <emacs-orgmode@gnu.org>

On Saturday, October 23, 2010, mwnn <mwnnlin@gmail.com> wrote:
> Hi all,
>  =A0 =A0I added the following lines to my .emacs file to enable task cloc=
king across emacs sessions:
>
>  =A0 =A0(setq org-clock-persist 'history)
>  =A0 =A0(org-clock-persistence-insinuate)
>
> Now i am unable to quit Emacs with C-x C-c command. I get the following e=
rror message:
>
>  =A0 =A0Saving file /home/mwnn/.emacs.d/org-clock-save.el...
>  =A0 =A0make-backup-file-name-1: Wrong type argument: stringp, (".~")
>

Can you get us a traceback of this?

(setq debug-on-error t)

and then try to quit emacs. It should show some traceback information.
Post it here.

Thanks and Regards
Noorul