Expected BEGIN_ARRAY but was BEGIN_OBJECT with Retrofit

So I am trying to load data from the corona api.

This is my interface:

public interface RKIApi {

String BASE_URL = "https://services7.arcgis.com/mOBPykOjAyBO2ZKk/arcgis/rest/services/RKI_Landkreisdaten/FeatureServer/0/";

@Headers("Content-Type: application/json")
@GET("query?where=1%3D1&outFields=cases,deaths,cases_per_population,county,death_rate&returnGeometry=false&outSR=4326&f=json")
Call<List<County>> getCounties();
}

This is my county data class to which I wish to convert the data I receive:

public class County {

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

@SerializedName("cases")
@Expose
private int cases;

@SerializedName("deaths")
@Expose
private int deaths;

@SerializedName("cases_per_population")
@Expose
private float casesPerPopulation;

@SerializedName("death_rate")
@Expose
private float deathRate;

public County(String county, int cases, int deaths, float casesPerPopulation, float deathRate) {
    this.county = county;
    this.cases = cases;
    this.deaths = deaths;
    this.casesPerPopulation = casesPerPopulation;
    this.deathRate = deathRate;
}

... Getters and Setters....

And this is how I am trying to load the data:

Retrofit retrofit = new Retrofit.Builder().baseUrl(RKIApi.BASE_URL)
            .addConverterFactory(GsonConverterFactory.create(gson))
            .build();

    RKIApi apiService = retrofit.create(RKIApi.class);

    Call<List<County>> call = apiService.getCounties();

    call.enqueue(new Callback<List<County>>() {
        @Override
        public void onResponse(@NonNull Call<List<County>> call,@NonNull Response<List<County>> response) {
            ... Do something ...
        }

        @Override
        public void onFailure(@NonNull Call<List<County>> call,@NonNull Throwable t) {
            System.out.println("========== ERROR ==========");
            System.out.println(t.getMessage());
        }
    });

However when I try to open the app with the debugger enabled all I get is Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $. Now this is obviously because the JSON doesn't start with the list of counties, I would however only like to load them. I have tried using the Expose Tag as seen above however its still not working.

Any help is very much appreciated

This means any of your parameter getting null or don't have anything in the json. Suppose you parse "name"= "pavel" but in the json that is "name"=null

The problem and reason of the error is either in a bad designed API or in an misinterpreted api. Your api is not sending a List of objects.
Most probably the API is spitting a JSON like this:

 { ...content }

Which is not a list of objects but a Single object.
Retrofit is expecting something like this:

 [ { ....County } { ..County  }? ]

because You told to retrofit to return a LIST of List<County>.

Where the [ means an array of Objects.
So in order to fix this You have 2 choices. Either change the api so it will return always the square brackets even for empty List like this [] or this [{ one object }] for a single result.

Either parse Your results manually. Check please this question here on stackoverflow:

Manually parse part of a response when using Retrofit