From mboxrd@z Thu Jan  1 00:00:00 1970
From: mwnn <mwnnlin@gmail.com>
Subject: Unable to quit emacs after enabling Clocking
Date: Sat, 23 Oct 2010 21:38:23 +0530
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To: emacs-orgmode@gnu.org

Hi all,
     I added the following lines to my .emacs file to enable task 
clocking across emacs sessions:

     (setq org-clock-persist 'history)
     (org-clock-persistence-insinuate)

Now i am unable to quit Emacs with C-x C-c command. I get the following 
error message:

     Saving file /home/mwnn/.emacs.d/org-clock-save.el...
     make-backup-file-name-1: Wrong type argument: stringp, (".~")

Regards,
mwnn