Error while reading data from excel,I was trying to set up a keyword driven frameworrk from scratch, not completed but now iam getting wn error

Question

Error while reading data from excel,I was trying to set up a keyword driven framework from scratch, not completed but now iam getting wn error

I have put all classes below,Error is showing in "excelUtils class" and "Driverscript class "

Below is my error

Error

Exception in thread "main" java.lang.NullPointerException
    at Utility.excelUtils.getCellData(excelUtils.java:31)
    at executionengine.Driverscript.main(Driverscript.java:39)

This is Driver script Driverscript class

package executionengine;

import java.lang.reflect.Method;
import config.ActionKeywords;
import Utility.excelUtils;

public class Driverscript {
    //This is a class object, declared as 'public static'
    //So that it can be used outside the scope of main[] method
    public static ActionKeywords actionKeywords;
    public static String sActionKeyword;
    //This is reflection class object, declared as 'public static'
    //So that it can be used outside the scope of main[] method
    public static Method method[];

    //Here we are instantiating a new object of class 'ActionKeywords'
    public Driverscript() throws NoSuchMethodException, SecurityException{
        actionKeywords = new ActionKeywords();
        //This will load all the methods of the class 'ActionKeywords' in it.
                //It will be like array of method, use the break point here and do the watch
        method = actionKeywords.getClass().getMethods();
    }

    public static void main(String[] args) throws Exception {

        //Declaring the path of the Excel file with the name of the Excel file
        String sPath = "E://Jino_testing//Automation_project//Hybrid_framework-master//src//main//resources//dataengine//Zmarta.xls";

        //Here we are passing the Excel path and SheetName to connect with the Excel file
        //This method was created in the last chapter of 'Set up Data Engine'       
        excelUtils.setExcelFile(sPath, "Test Steps");

        //Hard coded values are used for Excel row & columns for now
        //In later chapters we will use these hard coded value much efficiently
        //This is the loop for reading the values of the column 3 (Action Keyword) row by row
        //It means this loop will execute all the steps mentioned for the test case in Test Steps sheet
        for (int iRow = 1;iRow <= 9;iRow++){
            //This to get the value of column Action Keyword from the excel
            sActionKeyword = excelUtils.getCellData(iRow, 3);
            //A new separate method is created with the name 'execute_Actions'
            //You will find this method below of the this test
            //So this statement is doing nothing but calling that piece of code to execute
            execute_Actions();
            }
        }

    //This method contains the code to perform some action
    //As it is completely different set of logic, which revolves around the action only,
    //It makes sense to keep it separate from the main driver script
    //This is to execute test step (Action)
    private static void execute_Actions() throws Exception {
        //This is a loop which will run for the number of actions in the Action Keyword class 
        //method variable contain all the method and method.length returns the total number of methods
        for(int i = 0;i < method.length;i++){
            //This is now comparing the method name with the ActionKeyword value got from excel
            if(method[i].getName().equals(sActionKeyword)){
                //In case of match found, it will execute the matched method
                method[i].invoke(actionKeywords);
                //Once any method is executed, this break statement will take the flow outside of for loop
                break;
                }
            }
        }
 }

This is excel Utils excelUtils class

package Utility;

import java.io.FileInputStream;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;




public class excelUtils {

    private static HSSFWorkbook ExcelWBook;
    private static HSSFSheet ExcelWSheet;
    private static HSSFCell Cell;



    public static void setExcelFile (String path, String Sheetname) throws Exception {

        FileInputStream  ExcelFile = new FileInputStream (path);
        ExcelWBook = new HSSFWorkbook(ExcelFile);
        ExcelWSheet = ExcelWBook.getSheet(Sheetname);


    }


    public static String getCellData (int RowNum, int ColNum) {
        Cell = ExcelWSheet.getRow(RowNum).getCell(ColNum);
        String CellData = Cell.getStringCellValue();
        return CellData;




    }


    }