错误 IllegalStateException：应为 BEGIN_ARRAY 但为 BEGIN_OBJECT [关闭]

有一个代码：

class ApiDataSourceIMPL(private val exchangeRateDataSource: ExchangeRateDataSource):
        ApiDataSource {
    
        override fun startMigration (context: Context) {
    
            val call = ApiClient.instance?.api?.loadExchangeRateApi()
            call?.enqueue(object: Callback<ArrayList<ExchangeRateApiModel>> {
                override fun onResponse(
                    call: Call<ArrayList<ExchangeRateApiModel>>,
                    response: Response<ArrayList<ExchangeRateApiModel>>
                ) {
                    // создаём список
                    var loadExchangeRate: ArrayList<ExchangeRateApiModel>? = null
                    // очищаем массив
                    loadExchangeRate?.clear()
                    // получаем данные с сервера
                    loadExchangeRate = (response.body() as ArrayList<ExchangeRateApiModel>?)!!
    
                    // помещение данных в локальную базу данных
                    for (audit in loadExchangeRate) {
    
                       // audit.id = 1
                        audit.id?.let {
                            ExchangeRateModel(
                                it,
                                audit.AUD.toString(),
                                audit.EUR.toString(),
                                audit.JPY.toString(),
                                audit.MDL.toString(),
                                audit.RUB.toString(),
    
                            )
                        }?.let {
                            exchangeRateDataSource.insert(
                                it
                            )
                        }
    
                    }
    
                    Toast.makeText(context, "ЗАГРУЗКА", Toast.LENGTH_SHORT).show()
                }
    
                override fun onFailure(call: Call<ArrayList<ExchangeRateApiModel>>, t: Throwable) {
                    Toast.makeText(context, "ОШИБКА! ВКЛЮЧИТЕ ИНТЕРНЕТ!", Toast.LENGTH_SHORT).show()
    
                }
            })
    
        }
    
    }

执行后，Toast 弹出ОШИБКА! ВКЛЮЧИТЕ ИНТЕРНЕТ!，尝试调试，仅到达行call?.enqueue(object: Callback<ArrayList<ExchangeRateApiModel>>（独占），然后转到“紧急”消息

请告诉我可能是什么原因造成的以及如何解决它。

ApiClient 代码：

class ApiClient private constructor() {

    val api: ApiInterface
        get() = retrofit!!.create(
            ApiInterface::class.java)

    init {
        retrofit =
            Retrofit.Builder().baseUrl(BASE_URL).addConverterFactory(GsonConverterFactory.create())
                .build()

    }

    companion object {

        private val BASE_URL = "https://api.apilayer.com/"

        private var apiClient: ApiClient? = null
        private var retrofit: Retrofit? = null

        val instance: ApiClient?
            @Synchronized get() {

                if (apiClient == null) {

                    apiClient =
                        ApiClient()
                }

                return apiClient

            }
    }
}

获取请求：

@Headers("apikey: мой ключ")
@GET("exchangerates_data/latest?symbols=AUD%2CEUR%2CJPY%2CMDL%2CRUB&base=USD")
fun loadExchangeRateApi(): Call<ArrayList<ExchangeRateApiModel>>

包括互联网

<uses-permission android:name="android.permission.INTERNET" />在清单中是

甚至发送请求（在这个 api 中，每个月的请求数量是有限的，并且在应用程序启动后，计数器每次都会增加）

使用Log.e("ApiDataSource", "onFailure", t)得到：

2022-08-23 20:29:16.392 21052-21052/com.sem.exchangerate E/ApiDataSource: onFailure
    java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $
        at com.google.gson.stream.JsonReader.beginArray(JsonReader.java:350)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:80)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
        at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:40)
        at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:27)
        at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:243)
        at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:153)
        at okhttp3.RealCall$AsyncCall.execute(RealCall.java:174)
        at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:923)

json:

{
  "base": "USD",
  "date": "2022-08-23",
  "rates": {
    "AUD": 1.444127,
    "EUR": 1.00345,
    "JPY": 136.770153,
    "MDL": 19.351829,
    "RUB": 60.249987
  },
  "success": true,
  "timestamp": 1661277305
}

接收型号：

data class ExchangeRateApiModel (

    @SerializedName("id") @Expose
    var id: Int? = 1,

    @SerializedName("AUD") @Expose
    val AUD: Double? = null,
    @SerializedName("EUR") @Expose
    val EUR: Double? = null,
    @SerializedName("JPY") @Expose
    val JPY: Double? = null,
    @SerializedName("MDL") @Expose
    val MDL: Double? = null,
    @SerializedName("RUB") @Expose
    val RUB: Double? = null

)

写入数据库的模型：

@Entity(tableName = "exchange_rate_table")
class ExchangeRateModel(

    @PrimaryKey(autoGenerate = true)
    @ColumnInfo(name = "id")
    val id:Int,

    @ColumnInfo(name = "AUD")
    val AUD: String,
    @ColumnInfo(name = "EUR")
    val EUR: String,
    @ColumnInfo(name = "JPY")
    val JPY: String,
    @ColumnInfo(name = "MDL")
    val MDL: String,
    @ColumnInfo(name = "RUB")
    val RUB: String

)

// 我试图只获取货币值