Appium - 无法创建新会话.用于启动应用的活动不存在或无法启动

当我在选择了应用程序路径、包和启动活动的情况下启动 Appium 服务器时，服务器将从我的应用程序启动，我可以运行我的测试。测试完成后，我退出了驱动程序。

接下来，我尝试在服务器已经运行的情况下再次运行相同的测试。我有在TestFixtureSetUp中编写的功能（见下文）。但是，我收到以下错误：

SetUp : System.InvalidOperationException : A new session could not be created. (Original error: Activity used to start app doesn't exist or cannot be launched! Make sure it exists and is a launchable activity) (33)
   at OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse)
   at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.Remote.RemoteWebDriver.StartSession(ICapabilities desiredCapabilities)
   at OpenQA.Selenium.Appium.AppiumDriver..ctor(ICommandExecutor commandExecutor, ICapabilities desiredCapabilities)
   at MobileAutomationSample.AndroidSimpleTest.BeforeAll() in AndroidSimpleTest.cs: line 42

我的代码：

[TestFixture()]
public class AndroidSimpleTest
{
    private AppiumDriver driver;
    [TestFixtureSetUp]
    public void BeforeAll()
    {
        DesiredCapabilities capabilities = new DesiredCapabilities();
        capabilities.SetCapability("appium-version", "1.2.4.1");
        capabilities.SetCapability("platformName", "Android");
        capabilities.SetCapability("platformVersion", "5.0");
        capabilities.SetCapability("deviceName", "emulator-5554");
        capabilities.SetCapability("browserName", "");
        capabilities.SetCapability("app", "app-debug.apk");
        capabilities.SetCapability("appPackage", "com.company.app");
        capabilities.SetCapability("appActivity", "com.company.app.MainActivity");
        Uri androidUri = new Uri("http://127.0.0.1:4723/wd/hub");
        driver = new AppiumDriver(androidUri, capabilities, TimeSpan.FromSeconds(180));
        driver.Manage().Timeouts().ImplicitlyWait(TimeSpan.FromSeconds(5));
        WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(10));
    }
    [TestFixtureTearDown]
    public void AfterAll()
    {
        driver.Quit();
    }