centos6.0 中的dhcp服务无法开启

[root@localhost ~]# service dhcpd start
Starting dhcpd: [FAILED]
[root@localhost ~]# tail -f /var/log/messages
Apr 19 06:52:23 localhost dhcpd:
Apr 19 06:52:23 localhost dhcpd: This version of ISC DHCP is based on the release available
Apr 19 06:52:23 localhost dhcpd: on ftp.isc.org. Features have been added and other changes
Apr 19 06:52:23 localhost dhcpd: have been made to the base software release in order to make
Apr 19 06:52:23 localhost dhcpd: it work better with this distribution.
Apr 19 06:52:23 localhost dhcpd:
Apr 19 06:52:23 localhost dhcpd: Please report for this software via the CentOS Bugs Database:
Apr 19 06:52:23 localhost dhcpd: http://bugs.centos.org/
Apr 19 06:52:23 localhost dhcpd:
Apr 19 06:52:23 localhost dhcpd: exiting.
/etc/dhcpd.conf的具体配置如下
ddns-update-style none;
subnet 192.168.137.0 netmask 255.255.255.0{
option routers 192.168.137.4;
option subnet-mask 255.255.255.0;
option domain-name mycentos;
option domain-name-servers 200.3.4.10, 200.3.4.20;

range 192.168.137.81 192.168.137.200;
default-lease-time 86400;
max-lease-time 172000;
}
望高手解答，小弟在此谢过