error message

[Aleppo University]

hi

i have a dns server configered on ip addres 10.128.16.14 and dhcp server configered on ip address 10.128.16.20

my dhcp.conf files is:
# Sample /etc/dhcpd.conf
# for aleppo University
default-lease-time 604800;
max-lease-time 2419200;
ddns-update-style ad-hoc;
option subnet-mask 255.0.0.0;
option broadcast-address 10.255.255.255;
option routers 10.128.16.23;
option domain-name-servers 10.128.16.14;
option domain-name "aleppo.shern.edu";

subnet 10.0.0.0 netmask 255.0.0.0 {
 ddns-updates on;
 ddns-hostname "dns01";
 ddns-domainname "aleppo.shern.edu";
 range 10.128.1.10 10.128.15.250;
 range 10.128.17.10 10.128.250.250;
 }
zone 10.in-addr.arpa.  { # the name of the ptr zone
 # The ip address of the primary name server
 primary 10.128.16.14;
}
zone aleppo.shern.edu. { # the name of the forward zone
 # the ip address of the primary name server
 primary 10.128.16.14;
}

and my named files is:
// generated by named-bootconf.pl

options {
 directory "/var/named";
 /*
  * If there is a firewall between you and nameservers you want
  * to talk to, you might need to uncomment the query-source
  * directive below.  Previous versions of BIND always asked
  * questions using port 53, but BIND 8.1 uses an unprivileged
  * port by default.
  */
 // query-source address port 53;
 forward first;
 forwarders {
 192.168.2.6;
 }; 
};

// 
// a caching only nameserver config
// 
zone "." {
 type hint;
 file "named.cash";
};

zone "127.in-addr.arpa" {
 type master;
 file "127.local";
};

zone "10.in-addr.arpa" {
 type master;
 file "db.10.zone";
 allow_update {
 10.128.16.20 ;
};
};

zone "aleppo.shern.edu" {
 type master;
 file "db.aleppo.hosts";
 allow_update {
 10.128.16.20 ;
};
};

but on my dhcp server i keep geting the following :

if IN A dns01.aleppo.shern.edu rrset doesn't exist add 1209600 IN A dns01.aleppo.shern.edu 10.128.1.33: timed.out.
DHCPREQUEST for 10.128.1.33 from 00:30:65:56:43:b0 via eth0
DHCPACK on 10.128.1.33 from 00:30:65:56:43:b0 via eth0
if IN A dns01.aleppo.shern.edu rrset doesn't exist add 1209600 IN A dns01.aleppo.shern.edu 10.128.1.33: timed.out.
DHCPREQUEST for 10.128.1.33 from 00:30:65:56:43:b0 via eth0
DHCPACK on 10.128.1.33 from 00:30:65:56:43:b0 via eth0

please advice

director of computer center.
university of aleppo .