Error in group mode settings - grouping must be selected (fatal error)

[peho72]

Hello,
When teacher have only groups and the meeting organizing target group is one group's students, Teacher set up "Group mode" = "Visible groups" or "Separate groups".
Why there is mandatory to have groupings?
Settings:
Group appointments = No group appointments
Group mode = Separate groups (could be also forced in Course settings)
Grouping = None (course does not include groupings)

Error message: "You must select a valid grouping!"

2nd question: What point is with grouping if you have 2 groups on the course and students number is 4-10?

Allowing grouping is nice option (allow several groups for one time slot #17), but making it mandatory makes this unusable.

B.R. Petri Hörkkö
Scheduler has also it's own issues but is some point better than this. I'd like to see one good properly working close meetings organizer in Moodle. Now there is only two poorly working options (so far disappointed).