title: Type universe cannot resolve assembly: System.Configuration AND Cannot resolve Assembly or Windows Metadata file 'System.Configuration.dll
body: <p>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 errors and is not running now.</p>
  
  <pre><code>1. Type universe cannot resolve assembly: System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a.      
  
  2. Cannot resolve Assembly or Windows Metadata file 'System.Configuration.dll'  
  </code></pre>
  
  <p>What is these errors ... I didn't find the satisfactory solution</p>
  
  <p><a href="https://i.stack.imgur.com/fryBT.png" rel="noreferrer"><img src="https://i.stack.imgur.com/fryBT.png" alt="enter image description here"></a></p>