问Chrome :使用ChromeDriver和Chrome通过命令行界面执行测试时的com.google.common.base.Preconditions.checkState(ZLjava/lang/String;)

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package testngex;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.support.ui.Select;
import org.testng.annotations.Test;

public class Login {

    @Test

    public void main() {

        WebDriver driver=new ChromeDriver();
        driver.manage().window().maximize();
        //Implicit wait
        driver.manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS);
           driver.get("url");
        driver.findElement(By.id("Username")).sendKeys("xxx");
        driver.findElement(By.id("Password")).sendKeys("xxx);
        driver.findElement(By.id("imgbtnLogin")).click();
        driver.quit();

    }
}

<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
 <suite name="Suite">
  <test thread-count="5" name="Test">
    <classes>
      <class name="testngex.Login"/>
    </classes>
  </test> <!-- Test -->
</suite> <!-- Suite -->

testngex.Login#main