"Invalid configuration mapping" in visual studio mac

Question

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 technically 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.

I also tried doing a MonoMac application, but it doesn't understand the Game class. How can I get Monogame working on my mac?

Answer 1

I also experienced this weird error. Solution was to remove project from solution and readd it to the solution as existing. sln file contained some old configuration info and this is what error says that there are some problems with sln file.