求助个，C# 使用 appium 连接 Android（4.3）模拟器，提示：
代码如下：
DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.SetCapability("browserName", "");
capabilities.SetCapability("appium-version", "1.1");
capabilities.SetCapability("platformName", "Android");
capabilities.SetCapability("platformVersion", "4.3");
capabilities.SetCapability("deviceName", "Android Emulator");
capabilities.SetCapability("app", @"F:\appium\appium-master\assets\ApiDemos.apk");
driver = new AppiumDriver(new Uri("http://127.0.0.1:4723/wd/hub"), capabilities);

进行测试，提示：
{"A exception with a null response was thrown sending an HTTP request to the remote WebDriver server for URL http://127.0.0.1:4723/wd/hub/session. The status of the exception was ReceiveFailure, and the message was: 基础连接已经关闭: 接收时发生错误。"}

检查 appium 命令行中发现错误：
Arguments to path.resolve must be string。

运行环境： vs2013 + 最新版 nodejs，appium，虚拟机是使用 Genymotion 加载