终于解决了！

It事实证明，这一切都与我的Xamarin项目中的calabash组件有关。

It turns out that it all had to do with the calabash component in my Xamarin project.

几个月前我第一次开始尝试测试时，我添加了calabash组件（如下图所示）

When I first started experimenting with tests few month ago I added the calabash component (image below)

当我开始添加更多测试时，我仍然有相同的组件。据我所知，这个组件是最新的。然后我尝试删除它并再次添加它但我再也找不到它了。

When I started adding some more tests now, I still had the same component. This component is up to date as far as I can tell. I then tried to remove it and add it again but I could no longer find it.

原来它现在被称为Xamarin Test Cloud Agent。我安装了该组件并完成了。

Turns out that now it is called "Xamarin Test Cloud Agent". I installed that component and DONE.

希望这对任何人都有帮助。

Hope this helps anyone.