Erro no Nagios - Desconhecido

Error in configuration file '/usr/local/nagios/etc/objects/localhost.cfg' - Line 2 (NULL value)
Error processing main config file!

***> The name of the main configuration file looks suspicious...

Make sure you are specifying the name of the MAIN configuration file on
the command line and not the name of another configuration file. The
main configuration file is typically '/usr/local/nagios/etc/nagios.cfg'

***> 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.


Pessoal esse erro é desconhecido por mim

A linha 2 representada , apenas é uma definicao de host...

Caso sabiam o que é fico agradecido.

Obrigado

posta ai o arquivo localhost.cfg para podemos analisar

# 'xxx' host definition

define host{

        use                     generic-host            ; Name of host template to use

        host_name               xxx

        alias                   xxx

        address                 10.221.0.45

        check_command           check-host-alive

        parents                 xxx

        max_check_attempts      8

        notification_interval   60

        notification_period     24x7

        notification_options    d

        contact_groups          admins

        }

 

e no "host_name" esta tudo certo ?