Nagios configuration

hello
i am having problam with nagios configuration i am trying to restart nagios process it gives error massage plz check your nagios configuration let me know
what changes does make a difference in nagios configuration

hello plz reply

from terminal as root - sudo su then type
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
it will tell you what line you messed up.