title: Missing assembly Microsoft.Phone.dll
body: <p>When I am building a Windows Phone 8.1 project, I get this error: </p>
  
  <p><a href="https://i.stack.imgur.com/IF0da.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IF0da.png" alt="http://i.imgur.com/VOgDatf.png"></a></p>
  
  <p>I have searched on the internet but can't find the solution. They say the <code>Microsoft.Phone.dll</code> should be located in <code>C:\Windows\System32</code> but it isn't there!</p>
  
  <p>I have also tried to make new blank Windows Phone Project 8.1 and tried to build that immediately and I get the same error.</p>
  
  <p>Thanks in advance!</p>