title: Missing an assembly reference when using Mono.Data.Sqlite
body: <p>I'm trying to use SQLite in unity for scoring purposes by following this tutorial <a href="https://www.youtube.com/watch?v=9SHz8mm-4Pw" rel="nofollow">https://www.youtube.com/watch?v=9SHz8mm-4Pw</a>.
  I'm using UNITY 5.3.5, Visual Studio 2015 and .Net framework: 4.6.</p>
  
  <p>This error appeared when I add:<code>using Mono.Data.Sqlite;</code></p>
  
  <blockquote>
    <p>Assets/Scripts/DataBaseManager.cs(4,12): error CS0234: The type or namespace name Data' does not exist in the namespace Mono'. Are you missing an assembly reference?</p>
  </blockquote>
  
  <p>The Mono.Data.Sqlite DLL file had been put into the Assets>Plugins folder and Assets folder but the error is still the same.</p>
  
  <p>*This dll can work previously, until I installed modules: Web Player, Microsoft Visual Studio Tools for Unity, Windows Build Support using Download Assistant to solve other issues.</p>
  
  <p>Hope to hear any of your advise on how to solve this issue. Thank you very much!</p>
  
  <p><a href="http://i.stack.imgur.com/X2j8V.png" rel="nofollow">Screenshoot of Visual Studio and Unity</a></p>