title: XNA not recognizing new class
body: <p>So XNA 4.0 is being a pain in the butt and selectively not recognizing classes.</p>
  
  <p>I have two projects in my solution, <strong>2DRPGLibrary</strong> and <strong>Avalon</strong>. A class in <strong>Avalon</strong>, named <em>GamePlayScreen</em>, is trying to reference 2 classes in <strong>2DRGLibrary</strong>: <em>World</em> and <em>WorldBuilder</em>.</p>
  
  <p>However, <em>WorldBuilder</em> gives me the annoying "Type or namespace X could not be found" error. I've included a reference to <strong>2DRPGLibrary</strong> in <strong>Avalon</strong>, and <em>World</em> doesn't produce an error. It's only tripping over <em>WorldBuilder</em>.</p>
  
  <p>Help? </p>
  
  <p>EDIT: The only thing that seems relevant is that the 2DRPGLibrary has a Client target class when it should be v4.0 instead. There doesn't seem to be a way to fix this, though, because it doesn't have a .csproj file like Avalon...thoughts?</p>