Type universe cannot resolve assembly: System.Configuration AND Cannot resolve Assembly or Windows Metadata file 'System.Configuration.dll

Question

I am developing UWP App via VS2015 in Win10. My App was running perfect, but just today when I start running my App, even I didn\'t make changes of such ... and It shows 2 error

Answer 1

UWP C# XAML App, MVS2017

I had a similar issue today, with the following error when building, after installing a new NUGET package (concretely NUGET package Microsoft.Toolkit.Uwp.UI.Controls):

"cannot resolve assembly or windows metadata file 'type universe cannot resolve assembly: netstandard, version=2.0.0.0, culture=neutral, …"

It turned out to be an incompatibility between NUGET package versions. I found out by fidgetting a bit in NUGET package manager with the package versions. A bit of trial and error, and I found out that by downgrading the version of the newly installed package, and upgrading the version of another package (in this case NewtonSoft.Json), I started building normally without errors or warnings...