title: The name "XXX" does not exist in the namespace "clr-namespace:MySpace" Windows Phone 7.1
body: <p>I am converting my existing WP8 app to WP7.1. I placed several converter classes in the App.xaml Application.Resources section but Visual Studio complains that they do not exist in the namespace which they are.</p>
  
  <p>All the converters are located inside the <code>Class Converter</code> folder.</p>
  
  <p>The code works fine in WP8 project though so what do I need to change to make it compile in WP7.1?</p>
  
  <p><img src="https://i.stack.imgur.com/TOUrD.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/Zajth.png" alt="enter image description here"></p>
  
  <p><strong>UPDATE:</strong> I can now compile it. For some reason, one of the WP8 classes, (the multiresolution chooser) is preventing the project from compiling. I removed it since WP7 only support one resolution and that fixed it.</p>