workbook,Cell[ ] row, 그리고 get 구문에서 막혔습니다 ㅠㅠ

Question

package com.example.examlast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.FileAsyncHttpResponseHandler;

import jxl.Cell;

import jxl.WorkbookSettings;
import jxl.read.biff.BiffException;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Adapter;
import android.widget.ProgressBar;
import android.widget.Toast;

import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import cz.msebera.android.httpclient.Header;

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;
    Adapter adapter;
    AsyncHttpClient client;
    Workbook workbook;
    List<String> titles,descriptions,imageUrl;
    ProgressBar progressBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        String url = "https://github.com/bikashthapa01/excel-reafer-android-app/blob/master/story.xls?raw=true";



        recyclerView = findViewById(R.id.listOfData);
        progressBar = findViewById(R.id.progressBar);


        titles = new ArrayList<>();
        imageUrl = new ArrayList<>();



        client = new AsyncHttpClient();
        progressBar.setVisibility(View.VISIBLE);
        client.get(url,new FileAsyncHttpResponseHandler(this){



            @Override
            public void onFailure(int statusCode, Header[] headers, Throwable throwable, File file){

                progressBar.setVisibility(View.GONE);
                Toast.makeText(MainActivity.this,"Download Failed.", Toast.LENGTH_SHORT).show();

            }

            @Override
            public void onSuccess(int statuscode,Header[] headers, File file){

                progressBar.setVisibility(View.GONE);
                Toast.makeText(MainActivity.this,"FileDownloaded. ", Toast.LENGTH_SHORT).show();

                WorkbookSettings ws = new WorkbookSettings();
                ws.setGCDisabled(true);

                if(file != null){

                    try {
                            workbook = workbook.getWorkbook(file);
                            Sheet sheet = workbook.getSheet(0);
                            for(int i = 0; i < sheet.getRows();i++){


                                 Cell[] row = sheet.getRow(i);
                                 titles.add(row[0].getContents());
                                 descriptions.add(row[1].getContents());
                                 imageUrl.add(row[2].getContents());

                        }

                            showDate();

                        Log.d("Tag","onSuccess: "+titles);

                    } catch (IOException e){
                        e.printStackTrace();
                    } catch (BiffException e){
                        e.printStackTrace();
                    }
                }
            }
        });
    }
    private void showDate() {
        adapter = (Adapter) new com.example.examlast.Adapter(this,titles,descriptions,imageUrl);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter((RecyclerView.Adapter) adapter);
    }
}

현재 

if(file != null){

구문 이후 try 구문 안에서 getWorkbook,getRows,그리고 Cell있는 줄이 오류가 발생합니다 ㅠㅠ 디버그만 5시간 넘어가서 너무 힘들어서 정말 죄송하지만 이렇게 질문드립니다..ㅠㅠ 

혹시 도움이 될까봐 오류로그 사진이라도 올리겠습니다.

고수님들 한번만 부탁드려도 될까요...?ㅠㅠ