title: "Invalid configuration mapping" in visual studio mac
body: <p>I'm trying to use Monogame on a mac. All of the installation instructions are on Xamarin Studio, which to my knowledge, no longer exists as it was integrated into Visual Studio. I found that Monogame <em>technically</em> works with Visual Studio 2017 (Getting the 2017 version was an adventure in and of itself, as MonoGame didn't work with the 2019 version), however whenever I create a new project the (Project Name).Desktop folder has a red X mark beside it. when I hover over it, it says "Invalid Configuration Mapping." The strangest part is, when I build and run the project, I get no errors whatsoever. I still don't get my beautiful light blue window though.</p>
  
  <p>I also tried doing a MonoMac application, but it doesn't understand the Game class. How can I get Monogame working on my mac?</p>