Hi .. i m using RHEL5 and using nagios-2.10 and nagios-plugin.1.4.13
I have configure as told me on the documentation

/usr/sbin/useradd -m nagios
passwd nagios
/usr/sbin/groupadd nagcmd
/usr/sbin/usermod -a -G nagcmd nagios
/usr/sbin/usermod -a -G nagcmd apache

tar xzf nagios-2.10.tar.gz
cd nagios-2.10
./configure --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios --with-command-group=nagcmd
make all
make install
make install-init
make install-config
make install-commandmode
make install-webconf

htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

tar xzf nagios-plugins-1.4.13.tar.gz
cd nagios-plugins-1.4.13
./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make install

chkconfig --add nagios
chkconfig nagios on

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

---this shows an error as ----
Nagios 2.10
Copyright (c) 1999-2007 Ethan Galstad
Last Modified: 10-21-2007
License: GPL

Reading configuration data...


***> One or more problems was encountered while processing the config files...

Check your configuration file(s) to ensure that they contain valid
directives and data defintions. If you are upgrading from a previous
version of Nagios, you should be aware that some variables/definitions
may have been removed or modified in this version. Make sure to read
the HTML documentation regarding the config files, as well as the
'Whats New' section to find out what has changed.

tell me wht shud i do ???