Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $ почему возникает ошибка?

Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $

{
  "city": [
    {
      "city_id": "6",
      "country_id": "4",
      "region_id": "5",
      "name": "Балларат"
    },
    {
      "city_id": "7",
      "country_id": "4",
      "region_id": "5",
      "name": "Бендиго"
    },
    {
      "city_id": "8",
      "country_id": "4",
      "region_id": "5",
      "name": "Варрнамбул"
    }
  ]
}

class Cities {
  @SerializedName("city")
  private List city;
  public List getCity() {
    return city;
  }
}

class CityValue {
  @SerializedName("city_id")
  @Expose
  private String city_id;

  @SerializedName("counter_id")
  @Expose
  private String counter_id;

  @SerializedName("region_id")
  @Expose
  private String region_id;

  @SerializedName("name")
  @Expose
  private String name;
}