Hi all,

Currently running check_mk 1.2.4p5. Updating any changes in UI site and activating the changes to take effect, causes the following Nagios error in the UI and unable to alter any of the check_mk settings (users/groups/etc....).

I have removed the entries from the pending action log files which cleared out the UI pending items. Created a test user and attempted to update the changes and results to the same exact error.


Error
Nagios Core 3.5.0 Copyright (c) 2009-2011 Nagios Core Development
Team and Community Contributors Copyright (c) 1999-2009 Ethan
Galstad Last Modified: 03-15-2013 License: GPL Website:
http://www.nagios.org Reading configuration data... Read main config file okay... Processing object config directory '/omd/sites/monitor/etc/nagios/conf.d'...
Processing object config file '/omd/sites/monitor/etc/nagios/conf.d/templates.cfg'... Processing object config file '/omd/sites/monitor/etc/nagios/conf.d/pnp4nagios.cfg'... Processing object config file '/omd/sites/monitor/etc/nagios/conf.d/jmx4perl_nagios.cfg'...
Processing object config file '/omd/sites/monitor/etc/nagios/conf.d/check_mk_templates.cfg'...
Processing object config file '/omd/sites/monitor/etc/nagios/conf.d/commands.cfg'... Processing object config file '/omd/sites/monitor/etc/nagios/conf.d/notification_commands.cfg'...
Processing object config file '/omd/sites/monitor/etc/nagios/conf.d/timeperiods.cfg'... Processing object config file '/omd/sites/monitor/etc/nagios/conf.d/thruk_templates.cfg'...
Processing object config file '/omd/sites/monitor/etc/nagios/conf.d/mkeventd_notifications.cfg'...
Processing object config file '/omd/sites/monitor/etc/nagios/conf.d/check_mk_objects.cfg'...

Error: Could not find any contactgroup matching 'hostingops' (config file '/omd/sites/monitor/etc/nagios/conf.d/mkeventd_notifications.cfg', starting on line 5)

Error processing object config files! ***> 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. Configuration for monitoring core is invalid. Rolling back.

Quite possibly you could learn something about nagios and how it works by going to the website at nagios.org. From that site I quote:
Since nagios is designed to prevent unauthorized changes it would be helpful for you to understand the admin requirements involved in making changes of any kind once you have installed and configured nagios for protection of your system.

The last paragraph in what you posted tell you what happened and what you need to do.