I have allready setup DNS in RHEL5.
then when i type SERVICE NAMED START the following massage show:
Starting named:
Error in named configuration:
zone localdomain/IN: loading master file localdomain.zone: file not found
_default/localdomain/IN: file not found
zone localhost/IN: loading master file localhost.zone: file not found
_default/localhost/IN: file not found
zone 0.0.127.in-addr.arpa/IN: loading master file named.local: file not found
_default/0.0.127.in-addr.arpa/IN: file not found
zone 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa/IN: loading master file named.ip6.local: file not found
_default/0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa/IN: file not found
zone 255.in-addr.arpa/IN: loading master file named.broadcast: file not found
_default/255.in-addr.arpa/IN: file not found
zone 0.in-addr.arpa/IN: loading master file named.zero: file not found
_default/0.in-addr.arpa/IN: file not found
[FAILED]

WHAT I AM DOING NOW?

Your directory option in named.conf is not pointing to the correct directory.

Also check if you are running chrooted that the directory structure and zone files exist under the chroot

To test your configuration use the command

i configure /etc/named.conf file which was i copyed from
/usr/share/doc/bind/sample/etc/named.rcf1912.zone to rename /etc/named.conf....
is it correct for DNS configure file named.conf?
named-chkconf then output is=
/etc/named.conf:53: zone '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa': already exists previous definition: /etc/named.conf:36
/etc/named.conf:59: zone '255.in-addr.arpa': already exists previous definition: /etc/named.conf:42
/etc/named.conf:65: zone '0.in-addr.arpa': already exists previous definition: /etc/named.conf:48

what i am doing right now ?

That is not correct, to get a correct sample file install caching-nameserver