＆＃34;表达类型的问题是模糊的，没有更多的上下文＆＃34;

Question

错误发生在页面底部。我目前正在运行Xcode 7.0，在尝试保存事件时无法编译代码。我用相同的问题查看了其他人的帖子，但它并不适用于我的代码。我很感激帮助！

func insertEvent(store: EKEventStore) {
// 1
    let calendars = store.calendarsForEntityType(EKEntityType.Event)
    as! [EKCalendar]

    for calendar in calendars {
        // 2
        if calendar.title == "ioscreator" {
            // 3
            let startDate = NSDate()
            // 2 hours
            let endDate = startDate.dateByAddingTimeInterval(2 * 60 * 60)
            // 4
            // Create Event
            var event = EKEvent(eventStore: store)
            event.calendar = calendar
            event.title = "New Meeting"
            event.startDate = startDate
            event.endDate = endDate
            // 5
            // Save Event in Calendar
            var error: NSError?
            let result = store.saveEvent(event, span: .ThisEvent, error: &error) // Error is here
                if result == false {
                    if let theError = error {
                        print("An error occured \(theError)")
                    }
                }
        }
    }
}