How to set combobox model correctly

The logs:
2024-10-19 02:10:26 [482,072ms] [Warning] [omni.kit.widget.settings.settings_model] Unable to set “None” to combobox model. Setting path: /persistent/app/anim/timeDisplay
How to solve these warnnings?
The version:

Are you experiencing any functional issues or limitations due to this warning, or is it primarily a concern for log cleanliness? If possible, sharing the steps that lead to this warning could help diagnose the problem.

Do you solve it? I have this problem too.