Selenium ChromeDriver在发布后不导航URL

public class HomeController : Controller
{
    public ActionResult Index()
    {
        try
        {
            AppSettingsReader configReader = new AppSettingsReader();
            using (var driver = new ChromeDriver(HostingEnvironment.ApplicationPhysicalPath)) //here I used latest chrome driver(V 2.42.59)
            {
                driver.Manage().Timeouts().ImplicitWait = TimeSpan.FromSeconds(30);
                //driver.Manage().Timeouts().PageLoad = TimeSpan.FromMinutes(2);

                driver.Url = "https://crims.crib.lk";
                var userNameField = driver.FindElementById("txtUserName");
                var userPasswordField = driver.FindElementById("txtPassword");
                driver.Quit();
            }
        }
        catch (Exception ex)
        {
            Logger.LogWriter(" WebApplication2.Controllers", ex, "HomeController", "Index");
        }

        return View();
    }
}

Source :WebApplication2
Module:HomeController
Method:Index
Message :no such element: Unable to locate element:
{"method":"id","selector":"txtUserName"}
  (Session info: chrome=69.0.3497.100)
  (Driver info: chromedriver=2.42.591088
(7b2b2dca23cca0862f674758c9a3933e685c27d5),platform=Windows NT
6.2.9200 x86_64)
StackTrace :   at
OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response
errorResponse)

当浏览器不能正确导航到URL时,在VS中也发生了同样的错误。如何解决这个问题。请注意,我成功地安装了以下NuGet包。我正在windows server 2012 PC上工作。我在应用程序上托管了自己的IIS

NuGet Packages: RC | WebDriver | WebDriverBackedSelenium | Support

提前谢谢。