This error only appears if there are several startup projects in the solution.
I reproduced it by creating an empty solution with two empty console projects. When only one is set as launch, everything works fine. However, when configured as at startup, this error appears.
I also ran into this error, where the last post on January 14, 2017 says that the release of the upcoming version 1.1 will fix this problem: https://bugzilla.xamarin.com/show_bug.cgi?id=49417
You can check your version in the about field in VS. On VS2015, this is Help | About Microsoft Visual Studio , and I believe that this is Xamarin Inspector Support . Mine is at 1.0.0.0, so I guess I have to wait for the upcoming release :)
Update
Oddly enough, the update is only for the Xamarin inspector (less than 30 minutes after the answer). The first download of my test solution still popped up with an error, but after that it seems fine.
update (February 28, 2017) :
I am still experiencing a problem with the following version: Xamarin Inspector Support 1.1.2.0 (cdc01b9f4466b6dcc3095828824a12d041c9f55e) Adds support for inspecting Xamarin and WPF apps.
Eben roux
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