测试百度登陆拿不到结果：报错

package seleniumTestLoginModule;

import org.openqa.selenium.*;
import org.openqa.selenium.firefox.FirefoxDriver;

class LoginDetail
{	
	public void case1(String s) throws Exception 
	{
		
		if(s.equals("请您填写手机/邮箱/用户名"))
		{
			System.out.println("Case1: 当没有输入用户名和密码时候点击登陆，将提示： "
	    	+ s + "---Pass");
		}
		else
		{
			System.out.println("Case failed, " + "CurrentText is " + s);
		}
		Thread.sleep(3000);
	}
	public void case2(String s) throws Exception
	{
		if(s.equals("请您填写密码"))
		{
			System.out.println("Case2: 当密码为空时候点击登陆，将提示： "
	    	+ s + "---Pass");
		}
		else
		{
			System.out.println("Case failed, " + "CurrentText is " + s);
		}
		Thread.sleep(3000);
	}
	public void case3(String s) throws Exception
	{
		if(s.equals("请您填写手机/邮箱/用户名"))
		{
			System.out.println("当输入账号为空的时候点击登陆，将提示：" 
			+ s + "---Pass");
		}
		else
		{
			System.out.println("Current Text is " + s);
		}
	}
	/*public void case4(String s) throws Exception
	{
		if(s.equals("您输入的帐号或密码有误,忘记密码？"));
		{
			System.out.println("Case4: 当输入的密码有误时提示: " 
			+ s + "---Pass");
		}
		else
		{
			System.out.println("Current Text is " + s);
		}
	}*/

}



public class Login {

	public static void main(String[] args) throws Exception {
		// TODO 自动生成的方法存根
		LoginDetail loginDetail = new LoginDetail();
		WebDriver browser = new FirefoxDriver();
		browser.get("https://www.baidu.com");
		WebElement findLoginButton = browser.findElement(By.linkText("登录"));
		findLoginButton.click();
		
		Thread.sleep(3000);
		
		WebElement findAccountName = browser.findElement(By.id("TANGRAM__PSP_8__userName"));
		WebElement findPassword = browser.findElement(By.id("TANGRAM__PSP_8__password"));
		WebElement findSubmit = browser.findElement(By.id("TANGRAM__PSP_8__submit"));
		
		//case 1 当没有输入用户名和密码时候点击登陆
		findSubmit.submit();
		String s = browser.findElement(By.id("TANGRAM__PSP_8__error")).getText();
		loginDetail.case1(s);
				
		//case2 当密码为空的时候点击登陆
		findAccountName.clear();
		findPassword.clear();
		findAccountName.sendKeys("aa740578857");
		findPassword.sendKeys("");
		findSubmit.submit();
		s = browser.findElement(By.id("TANGRAM__PSP_8__error")).getText();
		loginDetail.case2(s);
		
		//case3 当账号为空的时候点击登陆
		findAccountName.clear();
		findPassword.clear();
		findAccountName.sendKeys("");
		findPassword.sendKeys("abc123456");
		findSubmit.submit();
		s = browser.findElement(By.id("TANGRAM__PSP_8__error")).getText();
		System.out.println(s + "1");
		
		//loginDetail.case3(s);
		
		/*
		//case4 当输入的密码错误的时候点击登陆
		findAccountName.clear();
		findPassword.clear();
		findAccountName.sendKeys("aa7405788");
		findPassword.sendKeys("abc123456");
		findSubmit.submit();
		s = browser.findElement(By.id("TANGRAM__PSP_8__error")).getText();
		//loginDetail.case4(s);
		*/
		
		browser.quit();
	}

}