MultiSelectBottomSheetField runtime TypeError

[javaone199]

MultiSelectBottomSheetField(
items: [
MultiSelectItem(1, 'Foo'),
MultiSelectItem(2, 'Bar'),
],
listType: MultiSelectListType.CHIP,
onConfirm: (values) {
print('selected: $values');
},
),

runtime error:
TypeError (type '(List) => void' is not a subtype of type '((List<int?>) => void)?')