title: Tweetinvi namespaces are not recognized although dll's are present
body: <p>I'm using creating a <strong>.Net 4.0</strong> application to post stuff to Twitter using the Tweetinvi API. I can't use packages, so I've downloaded the dll's and added them to my project:</p>
  
  <p><img src="https://i.stack.imgur.com/6Cxby.png" alt="References"></p>
  
  <p>Yet my includes are showing errors:</p>
  
  <p><img src="https://i.stack.imgur.com/44yzD.png" alt="Includes"></p>
  
  <p>My error console shows:</p>
  
  <blockquote>
    <p>Error 423 The type or namespace name 'Core' does not exist in the
    namespace 'Tweetinvi' (are you missing an assembly
    reference?)   {...file...}.cs 10  17  ApiProviders</p>
  </blockquote>
  
  <p>Can anyone tell me why this happens and how I could fix this?</p>