title: "Are you missing a using directive or an assembly reference" in visual studio 2013
body: <p>Good Day everyone. I'm developing a Cross Platform Application in Xamarin.Forms when I encounter this error "Are you missing a using directive or an assembly reference". My project is working fine before I install a Nuget package (Circle Image View in Xamarin), but when I uninstall it (without changing a single line of code) the said error started to appear.
  I tried to Build, Rebuild it but still it does not work. Anything I can do to fix this? Any help will be appreciated. Thanks a lot.</p>
  
  <p>These are the errors:</p>
  
  <p><strong>Error 1:</strong>    </p>
  
  <blockquote>
    <p>The type or namespace name 'Xamarin' could not be found (are you missing a using directive or an assembly reference?)</p>
  </blockquote>
  
  <p><strong>Error 2:</strong>    </p>
  
  <blockquote>
    <p>The type or namespace name 'Application' could not be found (are you missing a using directive or an assembly reference?)</p>
  </blockquote>
  
  <p><strong>Error 3:</strong>    </p>
  
  <blockquote>
    <p>The type or namespace name 'Xamarin' could not be found (are you missing a using directive or an assembly reference?)</p>
  </blockquote>
  
  <p><strong>Error 4:</strong>    </p>
  
  <blockquote>
    <p>The type or namespace name 'ContentPage' could not be found (are you missing a using directive or an assembly reference?)</p>
  </blockquote>