Error message "FileNotFoundException" is showing if I run the runnable .jar file from command line - selenium

Question

Error message is showing when I run the created runnable .jar file from command line
Error message "java.io.FileNotFoundException: Files\Learners_login_sheet_1.xlsx (The system cannot find the path specified)" is showing when I run the runnable .jar file from the Command line.
Same code is working fine if I run the same code from the Eclipse "run as TestNG".
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.stream.Collectors;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class Utility
{
public static ArrayList<String[]> getDataFromExcel()
{
ArrayList<String[]> myData = new ArrayList<String[]>();
Workbook dataWorkbook = null;
try
{
FileInputStream file = new FileInputStream(new File("Files/Learners_login_sheet_1.xlsx"));
String fileName="Learners_login_sheet_1.xlsx";
String fileExtensionName = fileName.substring(fileName.indexOf("."));
if(fileExtensionName.equals(".xlsx"))
{
dataWorkbook = new XSSFWorkbook(file);
}
else if(fileExtensionName.equals(".xls"))
{
dataWorkbook = new HSSFWorkbook(file);
}
}
catch (Exception e){
e.printStackTrace();
}
String sheetName="Learner_details";
org.apache.poi.ss.usermodel.Sheet signupSheet = dataWorkbook.getSheet(sheetName);
int rowCount = signupSheet.getLastRowNum()-signupSheet.getFirstRowNum();
for(int rowNum=2; rowNum <=rowCount; rowNum++ )
{
Row row=signupSheet.getRow(rowNum);
String Email=row.getCell(0).toString();
String Password=row.getCell(1).toString();
String obj[]={Email, Password};
myData.add(obj);
}
return myData;
}
}