Does someone has succesfully used this Nagios Export?

I tried to add Contacts and contants members, but I get the error": 'contactgroup (alias "") has 0 members!"

Do you have a better tutorial for exportiing cfg files to Nagios successfully?

I'm using version i-doit 1.16.3 OPEN version and the latest Nagios Export add-in.

This Kb-article doesn't has enough information to create a successfull Nagios export.
https://kb.i-doit.com/display/en/Nagios