There are no groups in the list for to sharing calendar

Hi, Friends. I use NC 27. I ran into this problem when I try to share a calendar, the list of groups is empty.
I have connected the system to MS Active directory. There are groups and users from AD in the NC settings.
I created the group manually, but I can’t add members to it, and it also doesn’t appear in the list of callender groups.
What should i do for to fixing this problem
- users
- Calendar