Wassan goes for a walk with pi

 isc-dhcp-server.service - LSB: DHCP server
   Loaded: loaded (/etc/init.d/isc-dhcp-server)
   Active: failed (Result: exit-code) since Sat 2016-12-10 23:48:56 CST; 7min ago
  Process: 582 ExecStart=/etc/init.d/isc-dhcp-server start (code=exited, status=1/FAILURE)

Dec 10 23:48:54 raspberrypi dhcpd[646]: Internet Systems Consortium DHCP Server 4.3.1
Dec 10 23:48:54 raspberrypi dhcpd[646]: Copyright 2004-2014 Internet Systems Consortium.
Dec 10 23:48:54 raspberrypi dhcpd[646]: All rights reserved.
Dec 10 23:48:54 raspberrypi dhcpd[646]: For info, please visit https://www.isc.org/software/dhcp/
Dec 10 23:48:54 raspberrypi dhcpd[646]: Wrote 0 leases to leases file.
Dec 10 23:48:56 raspberrypi isc-dhcp-server[582]: Starting ISC DHCP server: dhcpdcheck syslog for diagnostics. ... failed!
Dec 10 23:48:56 raspberrypi isc-dhcp-server[582]: failed!
Dec 10 23:48:56 raspberrypi systemd[1]: isc-dhcp-server.service: control process exited, code=exited status=1
Dec 10 23:48:56 raspberrypi systemd[1]: Failed to start LSB: DHCP server.
Dec 10 23:48:56 raspberrypi systemd[1]: Unit isc-dhcp-server.service entered failed state.