I was working on a Xamarin.Forms project for weeks - everything compiled and I was able to distribute. The last things which happened as of 05/20, were 1) a Windows 10 update occurred, and 2) I did a VS 2017 update.
Now the entire project has this "type or namespace 'system'..." error on everything. This is happening 1) upon creating a brand new project and 2) before doing anything - even compiling. Just opening the "App.xaml.cs" file after a few seconds highlights all these things in red in the IDE
A screenshot of partial list of the "App.xaml.cs" file and the errors is here:
https://drive.google.com/open?id=17y-8tfJ5eJmp-JfBF8h0QlezioUHgSpz
I've lost several days now fighting to get the project back to where it was - stuck in Seattle!
Would appreciate any help!