TestWriter测试用例执行不通过

swllxj

1、测试用例为，打开百度首页，在文本框中输入“宇天科技”，点击“百度一下”
2、执行测试用例后，查看执行结果，测试用例均不通过
执行信息如下：
A exception with a null response was thrown sending an HTTP request to the remote WebDriver server for URL http://localhost:64301/session. The status of the exception was ReceiveFailure, and the message was: The underlying connection was closed: An unexpected error occurred on a receive.
D:\QQ图片20170405165258.png

swllxj

这个是截图的图片

swllxj

这个是用例的截图

swllxj

错误日志见doc文档，不知道为什么.log文件上传不了

swllxj

被测应用为用Chrome测试百度首页

swllxj

测试步骤只有3步，其他都是按照TW入门手册操作的

swllxj

谢谢你的回复！

swllxj

2017-04-18 17:45:44,642 [7232] ERROR TestWriter.Common.Log4net.Log4netLoggingService - 计算并记录执行结果到数据库出错：A exception with a null response was thrown sending an HTTP request to the remote WebDriver server for URL http://localhost:18500/session. The status of the exception was ReceiveFailure, and the message was: The underlying connection was closed: An unexpected error occurred on a receive.
OpenQA.Selenium.WebDriverException: A exception with a null response was thrown sending an HTTP request to the remote WebDriver server for URL http://localhost:18500/session. The status of the exception was ReceiveFailure, and the message was: The underlying connection was closed: An unexpected error occurred on a receive. ---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. ---> System.IO.IOException: Unable to read data from the transport connection: 远程主机强迫关闭了一个现有的连接。. ---> System.Net.Sockets.SocketException: 远程主机强迫关闭了一个现有的连接。
   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.GetResponse()
   at OpenQA.Selenium.Remote.HttpCommandExecutor.CreateResponse(WebRequest request)
   --- End of inner exception stack trace ---
   at OpenQA.Selenium.Remote.HttpCommandExecutor.CreateResponse(WebRequest request)
   at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute)
   at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.Remote.RemoteWebDriver.StartSession(ICapabilities desiredCapabilities)
   at OpenQA.Selenium.Remote.RemoteWebDriver..ctor(ICommandExecutor commandExecutor, ICapabilities desiredCapabilities)
   at OpenQA.Selenium.Remote.RemoteWebDriver..ctor(Uri remoteAddress, ICapabilities desiredCapabilities)
   at TestWriter.Web.SeleniumEmulator.SeleniumBrowser.?????????????????????????????????????????(Uri , ICapabilities )
   at TestWriter.Web.SeleniumEmulator.SeleniumBrowser.?????????????????????????????????????????(BrowserCoreTypes )
   at TestWriter.Web.SeleniumEmulator.SeleniumBrowser.Initialize()
   at TestWriter.Web.SeleniumEmulator.SeleniumEmulator.Start(DeviceInfo _deviceInfo, ApplicationCapability _capablity, String& info)
   at Bwf.EmulatorServices.EmulatorCreator.GetCommonEmulator(ApplicationCapability capability, DeviceInfo deviceInfo, String& info)
   at TestWriter.Agent.Core.CommonExecuteEnginee.CheckEmulator(ExecuteTest test, ExecuteTestStep step, ExecuteTestItem caseItem)
   at TestWriter.Agent.Core.CommonExecuteEnginee.ExecuteTestCase(ExecuteTestItem testcase, ExecuteTest test)
   at TestWriter.Agent.Core.CommonExecuteEnginee.ExecuteTest(ExecuteTest& test)

swllxj

这个报错是什么原因呢？