Problem with define host

[Arief Iqbal]

Hi,
 
 when verify nagios main configuration file, there's an error occur:
 
 Checking services...
 Error: Service check command '/usr/local/nagios/libexec/check_ping -H 192.168.87.100 -w 100.0,90% -c 200.0,60%' specified in service 'HTTP' for host 'test' notdefined anywhere!
         Checked 5 services.
 Checking hosts...
 Error: Contact group 'admins' specified in host 'test' is not defined anywhere!
         Checked 1 hosts.
 
 any advice will be very helpful for me :)
 
 thanks
 
 		
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