getting error for Keyword framework

Exception in thread “main” java.lang.NullPointerException at utility.ExcelUtils.getRowCount( at executionEngine.DriverScript.execute_TestCase( at executionEngine.DriverScript.main(

package executionEngine;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;

import java.lang.reflect.Method;
import java.util.Properties;

import config.ActionKeywords;
import config.Constants;
import utility.ExcelUtils;

public class DriverScript {

public static Properties OR;
public static ActionKeywords actionKeywords;
public static String sActionKeyword;
public static String sPageObject;
public static Method method[];

public static int iTestStep;
public static int iTestLastStep;
public static String sTestCaseID;
public static String sRunMode;

public DriverScript() throws NoSuchMethodException, SecurityException{
actionKeywords = new ActionKeywords();
method = actionKeywords.getClass().getMethods();

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

String Path_OR = Constants.Path_OR;
FileInputStream fs = new FileInputStream(Path_OR);
OR= new Properties(System.getProperties());

DriverScript startEngine = new DriverScript();

private void execute_TestCase() throws Exception {
//This will return the total number of test cases mentioned in the Test cases sheet
int iTotalTestCases = ExcelUtils.getRowCount(Constants.Sheet_TestCases);
//This loop will execute number of times equal to Total number of test cases
for(int iTestcase=1;iTestcase<=iTotalTestCases;iTestcase++){
//This is to get the Test case name from the Test Cases sheet
sTestCaseID = ExcelUtils.getCellData(iTestcase, Constants.Col_TestCaseID, Constants.Sheet_TestCases);
//This is to get the value of the Run Mode column for the current test case
sRunMode = ExcelUtils.getCellData(iTestcase, Constants.Col_RunMode,Constants.Sheet_TestCases);
//This is the condition statement on RunMode value
if (sRunMode.equals(“Yes”)){
//Only if the value of Run Mode is ‘Yes’, this part of code will execute
iTestStep = ExcelUtils.getRowContains(sTestCaseID, Constants.Col_TestCaseID, Constants.Sheet_TestSteps);
iTestLastStep = ExcelUtils.getTestStepsCount(Constants.Sheet_TestSteps, sTestCaseID, iTestStep);
//This loop will execute number of times equal to Total number of test steps
for (;iTestStep<=iTestLastStep;iTestStep++){
sActionKeyword = ExcelUtils.getCellData(iTestStep, Constants.Col_ActionKeyword,Constants.Sheet_TestSteps);
sPageObject = ExcelUtils.getCellData(iTestStep, Constants.Col_PageObject, Constants.Sheet_TestSteps);

private static void execute_Actions() throws Exception {

for(int i=0;i<method.length;i++){

Default Asked on April 27, 2017 in Selenium WebDriver.
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