Could not expand member hosts specified in hostgroup error

[sridhar]

I am trying to add the new hosts using nagmin i am getting the following error 

usr/local/nagios/bin# ./nagios -v /usr/local/nagios/etc/nagios.cfg 

Nagios 1.3 
Copyright (c) 1999-2004 Ethan Galstad (nagios at nagios.org) 
Last Modified: 10-24-2004 
License: GPL 

Reading configuration data... 

Error: Could not find host 'hostname' 

Error: Could not expand member hosts specified in hostgroup (config file '/usr/local/nagios/etc/HostGroup.cfg', line 33) 


***> 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 on the main and host config files, as well as the 
'Whats New' section to find out what has changed. 


		
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