Of course we do
I never used this feature to use SUDO, but I do know what it is telling you. Do a man on .netrc or .rhosts you will see that for security reasons the file needs to have specific permissions.
So therefor do a "chmod 440 /etc/sudoers" and see how it works again. This might have been caused by a patch installation a bad copy of the file, etc. At least you now know what it said.
B.T.W. 440 stands for :
r w x
4 2 1 =7
r - - r - - - - - /etc/sudoers
4 4 0
You see, it isn't that hard.
Regs David