I am trying to run easy-creds when launching dhcp-server i got an error i am new and i do not know how to fix it
i run this code and got this report

Code:
systemctl status isc-dhcp-server.service
the report :
Code:
● isc-dhcp-server.service - LSB: DHCP server
Loaded: loaded (/etc/init.d/isc-dhcp-server; bad; vendor preset: enabled)
Active: failed (Result: exit-code) since Mon 2016-01-25 02:25:18 CET; 45s ago
Docs: man:systemd-sysv-generator(8)
Process: 2011 ExecStart=/etc/init.d/isc-dhcp-server start (code=exited, status=1/FAILURE)

Jan 25 02:25:18 myvkali systemd[1]: Starting LSB: DHCP server...
Jan 25 02:25:18 myvkali dhcpd[2017]: Internet Systems Consortium DHCP Serve....3
Jan 25 02:25:18 myvkali dhcpd[2017]: Copyright 2004-2015 Internet Systems C...m.
Jan 25 02:25:18 myvkali dhcpd[2017]: All rights reserved.
Jan 25 02:25:18 myvkali dhcpd[2017]: For info, please visit https://www.isc...p/
Jan 25 02:25:18 myvkali isc-dhcp-server[2011]: dhcpd service already running...!
Jan 25 02:25:18 myvkali systemd[1]: isc-dhcp-server.service: Control proces...=1
Jan 25 02:25:18 myvkali systemd[1]: Failed to start LSB: DHCP server.
Jan 25 02:25:18 myvkali systemd[1]: isc-dhcp-server.service: Unit entered f...e.
Jan 25 02:25:18 myvkali systemd[1]: isc-dhcp-server.service: Failed with re...'.
Hint: Some lines were ellipsized, use -l to show in full.
the content of my
Code:
dhcpd.conf
Code:
ddns-update-style none;
authoritative;
log-facility local7;
subnet 10.0.0.0 netmask 255.255.255.0 {
range 10.0.0.100 10.0.0.200;
option domain-name-servers 8.8.8.8;
option routers 10.0.0.1;
option broadcast-address 10.0.0.255;
default-lease-time 600;
max-lease-time 7200;
}