Buen dia estoy aprendiendo a usar Nagios y depsues de las configuraciones me topo con este error alguien podria orientarme

[root@dsm_linux nagios]# /usr/bin/nagios -v /etc/nagios/nagios.cfg

Nagios Core 3.2.0
Copyright (c) 2009 Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 08-12-2009
License: GPL

Website: http://www.nagios.org
Reading configuration data...
   Read main config file okay...
Processing object config file '/etc/nagios/config/commands.cfg'...
Processing object config file '/etc/nagios/config/contacts.cfg'...
Processing object config file '/etc/nagios/config/contactgroups.cfg'...
Processing object config file '/etc/nagios/config/timeperiods.cfg'...
Processing object config file '/etc/nagios/config/templates.cfg'...
Processing object config file '/etc/nagios/config/hosts.cfg'...
Processing object config file '/etc/nagios/config/hostgroups.cfg'...
Processing object config file '/etc/nagios/config/services.cfg'...
Processing object config directory '/etc/nagios/config'...
Processing object config file '/etc/nagios/config/hosts.cfg'...
Warning: Duplicate definition found for host 'google' (config file '/etc/nagios/config/hosts.cfg', starting on line 3)
Error: Could not add object property in file '/etc/nagios/config/hosts.cfg' on line 4.
   Error processing object config files!

***> One or more problems was encountered while processing the config files...

     Check your configuration file(s) to ensure that they contain valid
     directives and data defintions. If you are upgrading from a previous
     version of Nagios, you should be aware that some variables/definitions
     may have been removed or modified in this version. Make sure to read
     the HTML documentation regarding the config files, as well as the
     'Whats New' section to find out what has changed.

y esta es la configuracion de hosts.cfg

#Para checar si la linea de salidaa internet es correcta

define host{
        host_name google
        alias   Conexion Internet
        address www.google.com
        use generic-host
}

define host{
        host_name miwangateway
        alias   ISP Gateway
        address 189.229.45.238
        parents google
        use generic-host
}

define host{
        host_name milangateway
        alias LAN Internet Gateway
        address 192.168.1.254
        parents miwangateway
        use generic-host
}

define host{
      host_name dsm_linux
      alias Servidor Nagios
      address 192.168.1.69
     # parents milangateway
      use generic-host
}

#define host{
     #   host_name dsm_vsa
    #    alias Windows Server
   #     address gwdsmvsa.myvnc.com
#      parents milangateway
#       use generic-host
#}