title: The type or namespace name 'Devices' does not exist in the namespace 'Microsoft'
body: <p>I found similar problems but any solution didn't help.
  I wanna declare <em>private PhotoCamera photoCamera;</em> with <em>using Microsoft.Devices;</em>
  but it's problem here.
  I am creating Windows Phone 8.1 app using Visual Studio 2013. Am I should install some Reference ?</p>
  
  <p>Thx in advance</p>