Error while starting the nagios

[Apollo]

Hi All

I have installed and configured the nagios on RH8.But while starting the nagios server ,i am getting the follwing error.
"Error: Dependent service specified in service dependency for service 'Website #2' on host 'nt1' is not defined anywhere".I think the nagios.cfg and cgi.cfg is not configured properly.If i give http://localhost/nagios on my browser,then  i am getting Error: Could not read host and service status information!

Thanks
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