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Каждый раз, когда я запускаю свое приложение, оно показывает сбой. Класс POJO находится сразу после основной активности

MainActivity.java

 package com.example.final_api;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.cardview.widget.CardView;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class MainActivity extends AppCompatActivity {
    RecyclerView recyclerView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        listingdata();
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
    }
    private void listingdata()
    {
        ApiInterface apiInterface = Retrofit.getRetrofit().create(ApiInterface.class);
        Call<POJO> listingdata = apiInterface.getdata();
        listingdata.enqueue(new Callback<POJO>() {
            @Override
            public void onResponse(Call<POJO> call, Response<POJO> response) {
                if(response.isSuccessful())
                {
                     recyclerAdapter adapter = new recyclerAdapter(response.body().getData());
                     recyclerView.setAdapter(adapter);
                }
            }
            @Override
            public void onFailure(Call<POJO> call, Throwable t) {
                Toast.makeText(getApplicationContext(), "Failure", Toast.LENGTH_SHORT).show();
            }
        });
    }

    public class recyclerAdapter extends RecyclerView.Adapter<recyclerAdapter.myViewHolder>
    {
        List<POJO.Datum> list;
        public recyclerAdapter(List<POJO.Datum> list) {
            this.list = list;
        }

        @NonNull
        @Override
        public recyclerAdapter.myViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.single_row_design , parent , false);
            recyclerAdapter.myViewHolder viewHolder = new recyclerAdapter.myViewHolder(view);
            return viewHolder;
        }

        @Override
        public void onBindViewHolder(@NonNull recyclerAdapter.myViewHolder holder, int position) {
            holder.id.setText(String.valueOf(list.get(position).getId()));
            holder.name.setText(String.valueOf(list.get(position).getEmployeeName()));
            Log.i("Error-name", String.valueOf(list.get(position).getEmployeeName()));
            holder.salary.setText(String.valueOf(list.get(position).getEmployeeSalary()));
            if(list.get(position).getEmployeeSalary() <= 500)
            {
                holder.cardView.setCardBackgroundColor(Color.rgb(252,0,0));
            }
            Log.i("Error-salary", String.valueOf(list.get(position).getEmployeeSalary()));
            holder.age.setText(String.valueOf(list.get(position).getEmployeeAge()));
            Log.i("Error-age", String.valueOf(list.get(position).getEmployeeAge()));
        }

        @Override
        public int getItemCount() {
            return list.size();
        }
        public class myViewHolder extends RecyclerView.ViewHolder
        {
            TextView id,name,age,salary;
            CardView cardView;
            public myViewHolder(@NonNull View itemView) {
                super(itemView);
                id = (TextView) itemView.findViewById(R.id.user_id);
                cardView = (CardView) itemView.findViewById(R.id.cardView);
                name = (TextView) itemView.findViewById(R.id.name);
                age = (TextView) itemView.findViewById(R.id.age);
                salary = (TextView) itemView.findViewById(R.id.salary);
            }
        }
    }
}


**POJO.java**

package com.example.final_api;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

import java.util.List;

public class POJO {
    @SerializedName("status")
    @Expose
    private String status;
    @SerializedName("data")
    @Expose
    private List<Datum> data = null;
    @SerializedName("message")
    @Expose
    private String message;

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public List<Datum> getData() {
        return data;
    }

    public void setData(List<Datum> data) {
        this.data = data;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public class Datum {

        @SerializedName("id")
        @Expose
        private Integer id;
        @SerializedName("employee_name")
        @Expose
        private String employeeName;
        @SerializedName("employee_salary")
        @Expose
        private Integer employeeSalary;
        @SerializedName("employee_age")
        @Expose
        private Integer employeeAge;
        @SerializedName("profile_image")
        @Expose
        private String profileImage;

        public Integer getId() {
            return id;
        }

        public void setId(Integer id) {
            this.id = id;
        }

        public String getEmployeeName() {
            return employeeName;
        }

        public void setEmployeeName(String employeeName) {
            this.employeeName = employeeName;
        }

        public Integer getEmployeeSalary() {
            return employeeSalary;
        }

        public void setEmployeeSalary(Integer employeeSalary) {
            this.employeeSalary = employeeSalary;
        }

        public Integer getEmployeeAge() {
            return employeeAge;
        }

        public void setEmployeeAge(Integer employeeAge) {
            this.employeeAge = employeeAge;
        }

        public String getProfileImage() {
            return profileImage;
        }

        public void setProfileImage(String profileImage) {
            this.profileImage = profileImage;
        }

    }
}
 

Retrofit.java

 package com.example.final_api;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import retrofit2.converter.gson.GsonConverterFactory;
public class Retrofit {
    private static String base_url = "http://dummy.restapiexample.com/api/v1/";

    static Gson gson = new GsonBuilder()
            .setLenient()
            .create();

    private static retrofit2.Retrofit retrofit;
    public static retrofit2.Retrofit getRetrofit()
    {
        if(retrofit==null)
        {
            retrofit = new retrofit2.Retrofit.Builder()
                    .baseUrl(base_url)
                    .addConverterFactory(GsonConverterFactory.create(gson))
                    .build();
        }
        return retrofit;
    }

}
 

APIInterface.java(Интерфейс)

 package com.example.final_api;

import retrofit2.Call;
import retrofit2.http.GET;

public interface ApiInterface {
    @GET("employees")
    Call<POJO> getdata();
}
 

I don’t understand wether it is problem with API or my code is not working.
I used same code for other API (https://reqres.in/api/users), though it was returning null but atleast it was getting response.