title: Visual Studio 2010 cannot add Newtonsoft.Json Library
body: <p>I've got a Problem with Visual Studio 2010 and the <code>Newtonsoft.Json</code> library.</p>
  
  <p>A few hours ago nothing was wrong with my project, but now it throws this error</p>
  
  <blockquote>
    <p>The type or namespace name 'NewtonSoft "could not be found. (Missing a using directive or an assembly reference?)</p>
  </blockquote>
  
  <p>--I just saw that the Reference was deleted and i can't re-add the <code>NewtonSoft.Json</code> library.</p>