I have installed Nagios 3.0.3 on a Compaq 6710b laptop running Ubuntu 8.04 following the instructions for installation.. On the web browser the error is read as "Could not read object configuration data"
On the command line , for the command " nagios -v /usr/local/nagios/etc/nagios.cfg", all the config files were verified and the displayed result was " Things look okay - No serious problems were detected during the pre-flight check"
But for the command " tail -f /usr/local/nagios/var/nagios.log" , the display shown was " Error: Cannot open main configuration file '/root/main_config_file' for reading!".
The installation is under /usr/local/nagios and all the configuration files are under the /etc folder inside the nagios folder.
Please help me fix the problem. Thanking you in advance.