Is this on an existing schedule board created prior to the upgrade? What happens if you create a new board? If that works, great, if not, see what Thomas indicated and that should help
I think the issue might in the 'Schedule Board Settings' entity. If you advance find 'Schedule Board Settings' and find your schedule board, the error will most likely be in the 'Settings' field with JSON text inside. Try creating a new schedule board and copying the JSON text into your original schedule board?
If not then you can try some of these fixes?
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