获取超过一周的事件时会出现奇怪的错误

Question

当预测设置为获取超过一周的事件时,我收到以下错误:

2014-02-18 22:48:04.540 SimpleEKDemo [5283:1803]从文件系统加载时区数据时出错.这是一个严重的问题.日历数据不保证准确.

我正在使用Apple Developer站点的SimpleEKDemo项目.我确实修改了fetchEvents,如下所示:

// Fetch events 
- (NSMutableArray *)fetchEvents
{

    //Create the end date components
    NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
    dateComponents.day = -7; //If set to -6 no error

    NSDate *startDate = [[NSCalendar currentCalendar] dateByAddingComponents:dateComponents
                                                                    toDate:[NSDate date]
                                                                   options:0];
    dateComponents.day = 7;
    NSDate *endDate = [[NSCalendar currentCalendar] dateByAddingComponents:dateComponents
                                                                    toDate:startDate
                                                                   options:0];
    // We will only search the default calendar for our events
    NSArray *calendarArray = [NSArray arrayWithObject:self.defaultCalendar];

    // Create the predicate
    NSPredicate *predicate = [self.eventStore predicateForEventsWithStartDate:startDate
                                                                      endDate:endDate
                                                                    calendars:calendarArray];

    // Fetch all events that match the predicate
    NSMutableArray *events = [NSMutableArray arrayWithArray:[self.eventStore eventsMatchingPredicate:predicate]];

    return events;
}

事件正在被正确获取.任何的想法？