onRetrofitFailure（）无法从START_OBJECT令牌中反序列化java.util.ArrayList的实例

给我一个Json数据，用于存储图像和其他一些数据。我正在尝试使用Retrofit在imageview中获取该图像。我创建了代码中详细介绍的必要内容的DTO。改装失败，我遇到了错误。我该如何解决？

1. 创建改造实例
2. 创建JSON数据和属性的DTO

3. 还创建了API服务https://s3.ap-south-1.amazonaws.com/zestlife/promotional_banner.json存储JSON数据的链接。

   @Parcelize
   @JsonIgnoreProperties(ignoreUnknown = true)
   open class MerchantPromotionDTO(
   
       @JsonProperty("image") var image: ImageUrlsDTO? = null,
       @JsonProperty("cta") var cta: CTADTO? = null,
       @JsonProperty("probability") var probability: Int? = 0,
       @JsonProperty("isDismissible") var isDismissible: Boolean? = true,
       @JsonProperty("showImmediate") var showImmediate: Boolean? = false
       ) : BaseResponseDTO()
   
   @Parcelize
       @JsonIgnoreProperties(ignoreUnknown = true)
       class MerchantpromotionBDTO(
       @JsonProperty("promotions") var promotions: ArrayList<MerchantPromotionDTO>?=null
   ) : BaseResponseDTO()
   
   @GET("https://demo6861386.mockable.io/banner/test")
   fun getPromotionalBanner(): Call<ArrayList<MerchantpromotionBDTO>>
   
   fun getPromotionalDetails(): LiveData<ResponseDTO<ArrayList<MerchantpromotionBDTO>>>{
       val pBannerDetails=MutableLiveData<ResponseDTO<ArrayList<MerchantpromotionBDTO>>>()
       ApiComponent.enqueue({
           getPromotionalBanner(
   
           )
       },object :OnRequestComplete<ArrayList<MerchantpromotionBDTO>>{
           override fun onComplete(responseDTO: ResponseDTO<ArrayList<MerchantpromotionBDTO>>) {
               pBannerDetails.value=responseDTO
           }
       }
   )
   

编辑：

override fun onStart() {
    super.onStart()

    populateData()
}

@Synchronized
private fun populateData() {       
    MerchantpromotionBDTO?.let {
        val promImageUrl = it.image?.getImageUrl(CommonUtils.getDisplayDensityLevel(context))
        picasso.load(if (promImageUrl.isNullOrEmpty()) null else promImageUrl)
                .placeholder(R.drawable.ic_placeholder_minimal)
                .into(ivMerchantPromotionBanner)
    }
}

我希望响应进入我的logcat并在Imageview中获取图像