Need urgent help to run in root

i trying terminal run in root, when type in sudo -s response, please help

last login: tue mar 13 21:46:28 on console
unknown-e4-ce-8f-31-f3-fa:~ joshua$ sudo -s
sudo: can't open /private/etc/sudoers: permission denied
sudo: no valid sudoers sources found, quitting
unknown-e4-ce-8f-31-f3-fa:~ joshua$

 

in case matters, , might lion, tell audience version of os x using.

user account using have "allow user administer computer" checked?

 

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