SENDMAIL Server - finally

Help me! i'm stuck with this error..

sendmail failed. The error was: Starting sendmail: 451 4.0.0 /etc/mail/sendmail.cf: line 91: fileclass: cannot open '/etc/mail/local-host-names': Group writable directory
451 4.0.0 /etc/mail/sendmail.cf: line 570: fileclass: cannot open '/etc/mail/trusted-users': Group writable directory
[FAILED]

all permission is set but still get this error :(

http://www.sendmail.org/tips/DontBlameSendmail.html

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just simple solution:

chmod go-w / /etc /etc/mail /usr /var /var/spool /var/spool/mqueue

chown root / /etc /etc/mail /usr /var /var/spool /var/spool/mqueue

i dunno wat happen but now my sendmail server works!!