problem config

[deny]

good evening 

its my first installation of nagios 
my hostname machine is : mandrake 
nagios is launched as user nagios , group nagios 
my local ip is 192.168.0.1
and my another machine has 192.168.0.3

i start nagios 

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

and i ve this error 

Nagios 1.1 starting... (PID=19605)
Error: Contact group 'nagios' specified in service 'FTP' for host
'mandrake' is not defined anywhere!
Error: Contact group 'nagios' specified in service 'PING' for host
'mandrake' is not defined anywhere!
Error: Contact group 'nagios' specified in service 'POP3' for host
'mandrake' is not defined anywhere!
Error: Contact group 'nagios' specified in service 'SMTP' for host
'mandrake' is not defined anywhere!


thanks for your help 




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