I am trying to perform data driven testing in TestNG But I am getting error

I am trying to perform data driven testing in TestNG.

But I am getting error:

FAILED: loginWay2sms

org.testng.internal.reflect.MethodMatcherException: Data provider mismatch.

What's wrong in my script.

package testNG;

import java.io.File;

import java.io.IOException;


import org.apache.commons.io.FileUtils;

import org.openqa.selenium.By;

import org.openqa.selenium.OutputType;

import org.openqa.selenium.TakesScreenshot;

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.WebDriverException;

import org.openqa.selenium.chrome.ChromeDriver;

import org.testng.Assert;

import org.testng.ITestResult;

import org.testng.annotations.AfterMethod;

import org.testng.annotations.DataProvider;

import org.testng.annotations.Test;


import jxl.Cell;

import jxl.Sheet;

import jxl.Workbook;

import jxl.read.biff.BiffException;


public class Datadriven_testing_in_testNG

{

public WebDriver driver;

@DataProvider(name="testData")

public Object[][] readExcel() throws BiffException, IOException{

//File location

File f=new File("C:\\Users\\Dell\\Desktop\\SELENIUM\\New folder\\akshay\\src\\akshay\\src\\testNG\\Waytosms testdata.xls");

//reading workbook

Workbook w=Workbook.getWorkbook(f);

//reading sheet

Sheet s=w.getSheet(0);

//Storing no.of rows and columns

int noofRows=s.getRows();

int noofCols=s.getColumns();

     //for getting the input data from excel

String inputData[][]=new String[noofRows-1][noofCols];

int count=0;

for(int i=1;i<noofRows;i++){

for(int j=0;j<noofCols;j++){

Cell c=s.getCell(j,i);

inputData[count][j]=c.getContents();

}

count++;

}

return inputData;


}

@Test(dataProvider="testData")

public void loginways2sms(String uname,String pwd) throws InterruptedException

{//open browser

System.setProperty("webdriver.chrome.driver", "C:\\Users\\Dell\\Desktop\\SELENIUM\\chromedriver.exe");

driver=new ChromeDriver();

//navigate to url

driver.get("https://www.edureka.co/");

Thread.sleep(4000);

//for username

driver.findElement(By.id("mobileNo")).sendKeys(uname);

//for password

driver.findElement(By.id("password")).sendKeys(pwd);

//for clicking on login

driver.findElement(By.xpath("(//button[contains(text(),'Login')])[1]")).click();

//verification point

String eurl="https://www.edureka.co/blog/pmp-certification/";

Assert.assertEquals(driver.getCurrentUrl(), eurl);

}

@AfterMethod

public void getTestResult(ITestResult testResult){

System.out.println("Test case name: "+testResult.getName());

System.out.println("Test case Result: "+testResult.getStatus());

//if status=1-->pass, status=2--->fail

int status=testResult.getStatus();

if(status==1){

driver.close();

}

else
{
try {

//take screenshot

File outfile=((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);

FileUtils.copyFile(outfile, new File("C:\\Users\\Dell\\Desktop\\SELENIUM\\New folder\\akshay\\src\\akshay\\src\\testNG"+testResult.getParameters()[0]+"Defect.jpg"));

} catch (WebDriverException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} 

}

driver.close();
}