service dhcpd restart error

dhcpd.conf 
host information-w {
                hardware ethernet f4-28-53-6c-0f-b0;
                fixed-address 10.209.205.5;
        }

service dhcpd restart

error

debug 1 hour、、、、
製作備份機。

# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp*/dhcpd.conf.sample
#
ddns-update-style       none;
ignore client-updates;
default-lease-time      28800;
max-lease-time          43200;
log-facility local7;
option time-offset 28800;
option routers          10.209.1.254;
option broadcast-address 10.209.255.255;
option domain-name      "w252.wcjs.tc.edu.tw";
option domain-name-servers 163.17.209.1, 163.17.40.1, 8.8.8.8;
authoritative;
subnet 10.209.0.0 netmask 255.255.0.0 {
        range 10.209.1.20 10.209.1.220;
        range 10.209.2.20 10.209.2.220;
        range 10.209.3.20 10.209.3.220;
        range 10.209.4.20 10.209.4.220;
 host academic-w {
                hardware ethernet b8:55:10:d9:78:24;
                fixed-address 10.209.205.1;
        }
        host principal-w {
                hardware ethernet f4:28:53:6c:0b:fd;
                fixed-address 10.209.205.3;
        }
        host information-w {
                hardware ethernet f4:28:53:6c:0f:b0;
                fixed-address 10.209.205.5;
        }
        host student-w {
                hardware ethernet b8:55:10:c9:b5:f4;
                fixed-address 10.209.205.7;
        }

}