title: Visual Studio 2015 DNX 451: Invalid reference when adding a 4.5.1 class library
body: <p>I'm using DNX 451 and I'm adding a reference to a 4.5.1 class library in the same solution, and I get dependency could not be resolved. I also add a reference to another 4.5.1 class library and it gets added as a package with wont allow me to access it inside the DNX 451 project.</p>
  
  <p>Why are my references not working? Do I need to use a different framework?</p>