我尝试用hive持久化我的日历数据，但是当我启动程序时，它抛出了以下代码：
[错误：flutter/运行时/dart_vm_initializer. cc（41）]未处理的异常：类型"Null"不是类型转换中类型"bool"的子类型
这是我的模型类：

@HiveType(typeId: 1)
class Event extends HiveObject {
  @HiveField(0)
  late String title;

  @HiveField(1)
  late DateTime eventDateTime;

  @HiveField(2)
  bool wholeDayEvent;

  Event({
    required this.title,
    required this.eventDateTime,
    required this.wholeDayEvent,
  });

  @override
  String toString() => title;
}

下面是我的显示小部件的构建方法：

Expanded(
              child: ValueListenableBuilder<Box<Event>>(
                valueListenable: Boxes.getEvents().listenable(),
                builder: (context, box, _) {
                  final events = box.values.toList().cast<Event>();
                  return ListView.builder(
                    itemCount: events.length,
                    itemBuilder: (context, index) {
                      return Container(
                        margin: const EdgeInsets.symmetric(
                          horizontal: 12.0,
                          vertical: 4.0,
                        ),
                        decoration: BoxDecoration(
                          border: Border.all(),
                          borderRadius: BorderRadius.circular(12.0),
                        ),
                        child: ListTile(
                          onTap: () => print('${box.values}'),
                          title: Text('${box.values}'),
                        ),
                      );
                    },
                  );
                },
              ),
            ),