dhcpd:bad subnet number/mask combination. subnet

Internet Systems Consortium DHCP Server 4.1.1-P1
Copyright 2004-2010 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/ 

/etc/dhcpd.conf line 34: subnet 192.168.1.1 

 netmask 255.255.255.0 

: bad subnet number/mask combination.
subnet 192.168.1.1 

 netmask 255.255.255.0 

 
                                       ^
Configuration file errors encountered -- exiting

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exiting

#
# Sample configuration file for ISC dhcpd for Debian
#
# $Id: dhcpd.conf,v 1.1.1.1 2002/05/21 00:07:44 peloy Exp $
#

# The ddns-updates-style parameter controls whether or not the server will
# attempt to do a DNS update when a lease is confirmed. We default to the
# behavior of the version 2 packages (‘none‘, since DHCP v2 didn‘t
# have support for DDNS.)
ddns-update-style none;

# option definitions common to all supported networks...
option domain-name "voidliu";
option domain-name-servers ns1.example.org, ns2.example.org;

default-lease-time 600;
max-lease-time 7200;

# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
#authoritative;

# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;

# No service will be given on this subnet, but declaring it helps the 
# DHCP server to understand the network topology.

subnet 192.168.1.1 netmask 255.255.255.0 {
range 192.168.1.16 192.168.1.128;
}

# This is a very basic subnet declaration. #subnet 10.254.239.0 netmask 255.255.255.224 { # range 10.254.239.10 10.254.239.20; # option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org; #}

subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.16 192.168.1.128;
}