ISO checksum menu in nautilus

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http://askubuntu.com – I'm using Ubuntu 11.10 x64, Unity, and Nautilus 3.2.1 I want to be able to perform checksum ISO in Nautilus. I have searched and found: http://www.addictivetips.com/ubuntu-linux-tips/nautilus-actions-extra-ad... and perform the procedures written in it. Once completed, the other menus appear, except the menu for "checksum verification". Then, when I run gksu nautilus-actions-config-tool I just asked to enter a user password, and .... nothing happens. What should I do, to bring up the "checksum verification" menu? I am very grateful for any respons (HowTos)