On MacBook Pro, Visual Studio for Mac, I open my project
I see my iOS project is grayed out and not set as startup
I set it as startup project, now it appears bold but still grayed out
It also has a red circle with X in it and "Invalid configuration mapping" message when I hover over it
Building it show error
/Users/me/source/myProj/packages/Xamarin.Forms.3.1.0.583944/build/netstandard2.0/Xamarin.Forms.targets(3,3):
Error XF001: Xamarin.Forms targets have been imported multiple times. Please check your project file and remove the duplicate import(s). (XF001) (myProject.App.iOS)