Error with Nagios configuration testing

[escarter]

Hello all,
Can someone please assist me on this? I am a newbie to Nagios, Installed the nagios core, created and updated some config files but when i ran the test configuration command i get the error below.

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

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Error: Could not find any host matching '$HOSTNAME$' (config file '/usr/local/nagios/etc/objects/services/local-clock-offset.cfg', starting on line 2)
Error: Failed to expand host list '$HOSTNAME$' for service 'local-clock-offset' (/usr/local/nagios/etc/objects/services/local-clock-offset.cfg:2)
   Error processing object config files!

Please need help

[dwhitfield]

It looks like you're calling a hostname that doesn't actually have a hostname.

Please post the two following files:
/usr/local/nagios/etc/objects/services/local-clock-offset.cfg
/usr/local/nagios/etc/nagios.cfg