我是新的Android应用程序开发与java和我试图从外部API获取数据。然而，我得到的错误：Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $。API会以下列格式传回结果：

[ {} ,{} , ... ]

其中我将每个对象定义为一个结果，并在API接口中列出这些结果。
每个对象的形式为：

{
 area: "athens",
  areaid: 1002,
  dailydose1: 276,
  dailydose2: 305,
  daydiff: -49,
  daytotal: 581,
  referencedate: "2021-05-27T00:00:00",
  totaldistinctpersons: 25446,
  totaldose1: 25446,
  totaldose2: 12098,
  totalvaccinations: 36960
}

我的代码：
CovidApi.java

public interface CovidApi {
    @GET("/")
    Call<List<CovidSingleResult>> getCovidData();
}

CovidSingleResult.java

public class CovidSingleResult {
    private int totalvaccinations;
    private int daytotal;
    private String referencedate;
    private int totaldose1;
    private int totaldose2;
    private String area;
    private int areaid;
    private int dailydose1;
    private int dailydose2;
    private  int daydiff;
    public String getArea() {
        return area;
    }
    public int getDailydose1() {
        return dailydose1;
    }
    public int getDaytotal() {
        return daytotal;
    }
    public int getDailydose2() {
        return dailydose2;
    }
    public String getReferencedate() {
        return referencedate;
    }
    public int getAreaid() {
        return areaid;
    }
    public int getTotaldose1() {
        return totaldose1;
    }
    public int getTotaldose2() {
        return totaldose2;
    }
    public int getDaydiff() {
        return daydiff;
    }
    public int getTotalvaccinations() {
        return totalvaccinations;
    }
}

Fragment.java ，我在这里调用api url

resultText = root.findViewById(R.id.response); //text to set api result 
                Gson gson = new GsonBuilder()
                        .setLenient()
                        .create();
                Retrofit retrofit = new Retrofit.Builder()
                        .baseUrl("https://data.gov.gr/api/v1/query/mdg_emvolio/date_from="+binding.inputFrom.getText()+"&date_to="+binding.inputTo.getText()+"/")
                        .addConverterFactory(GsonConverterFactory.create(gson))
                        .build();
                CovidApi covidApi = retrofit.create(CovidApi.class);
                Call<List<CovidSingleResult>> call = covidApi.getCovidData();
                call.enqueue(new Callback<List<CovidSingleResult>>() {
                    @Override
                    public void onResponse(Call<List<CovidSingleResult>> call, retrofit2.Response<List<CovidSingleResult>> response) {
                        if(!response.isSuccessful()){
                            resultText.setText("Code" + response.code());
                            return;
                        }else{
                            List<CovidSingleResult> covidSingleResults = response.body();
                            for(CovidSingleResult p : covidSingleResults){
                                String content = "";
                                content += "total vaccinations :" + p.getTotalvaccinations();
                                resultText.append(content);
                            }
                        }
                    }
                    @Override
                    public void onFailure(Call<List<CovidSingleResult>> call, Throwable t) {
                        resultText.setText(t.getMessage());
                    }
                });

我会很感激你的帮助