问类型错配误差

EN

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

public class WebElement {

    public static void main(String[] args) {
        WebDriver driver = new FirefoxDriver();
        driver.manage().window().maximize();

        driver.get("https://accounts.google.com/signin/v2/identifier?continue=https%3A%2F%2Fmail.google.com%2Fmail%2F&service=mail&sacu=1&rip=1&flowName=GlifWebSignIn&flowEntry=ServiceLogin");

        WebElement emailField = driver.findElement(By.id("identifierId"));


    }

}