The new_main_conf function fails because of to fields missing in table nagios_main (external_command_buffer_slots and check_result_buffer_slots) causing the import to faild for the main_conf.
To solve just create the to fields as int type and re-import. Both fields should be included in the sqldata/fruity-mysql.sql.
2008-05-21 22:22:09 UTC in Fruity : A Nagios Configuration Tool