I am getting an error after applying the configuration:
An error occurred while attempting to apply your configuration to Nagios Core. Monitoring engine configuration files have been rolled back to their last known good checkpoint.
Error: Could not add object property in file '/usr/local/nagios/etc/contacts.cfg' on line 2104.
Error: Service notification period '' specified for contact 'D01414531' is not defined anywhere!
Error: Could not register contact (config file '/usr/local/nagios/etc/contacts.cfg', starting on line 81)