try 在空对象引用上调用接口方法java.lang.Object kotlin.Lazy.getValue()

很抱歉我问了个愚蠢的问题.

我用谷歌搜索了这个问题，但答案对我来说不适用.

这是我的密码.

  data class Article(val id: Long, val title: String, val ingress: String, val image: String,
                       val dateTime: String, val tags: List<String>, val content: List<Item>, val created: Long, val changed: Long) {

        @delegate:Transient
        val formatDateString: String by lazy {
            val sdf = SimpleDateFormat("dd.MM.yyyy HH.mm")
            val date: Date = sdf.parse(dateTime)
            var time: String?
            if (date.year == Date().year) {
                time = SimpleDateFormat("dd MM,HH:mm", Locale.US).format(date)
            } else {
                time = SimpleDateFormat("dd MM yyyy,HH:mm", Locale.US).format(date)
            }
            time!!
        }

    }

当我试图得到formatDateString个值时，就会出现上述异常.

The codes access formatDateString as following

  override fun getCustomAdapter(): BaseQuickAdapter<CarListResponseBody.Article, BaseViewHolder> {
        return object : BaseQuickAdapter<CarListResponseBody.Article, BaseViewHolder>( R.layout.app_item_cars_list,dataList) {
            override fun convert(helper: BaseViewHolder, item: CarListResponseBody.Article) {
                helper.setText(R.id.tv_ingress,item.ingress)
                helper.setText(R.id.tv_date_time,item.formatDateString)
                helper.setText(R.id.tv_title,item.title)
                ImageLoadUtil.loadImgToView(context,item.image,helper.getView(R.id.img_car),null)
            }
        }
    }

我认为这个异常是由Gson引起的，但我不知道为什么