bash: groups: command not found

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http://askubuntu.com – i am jailing a user "testuser" from jailkit so i was able to do all things correctly by help http://www.marthijnvandenheuvel.com/2010/03/10/how-to-create-a-chroot-ss... http://olivier.sessink.nl/jailkit/howtos_ssh_only.html so all steps work correctly now when i log in through ssh i got this error bash: groups: command not found how do i fix it .i have google it & didn't find anything Error Pic (HowTos)