title: Unity , dll is not allowed to be included or does not exist
body: <p>I'm Trying to build my project to standalone however I'm getthing this error that is not allowing me to build. It's an error related to the TweetInvi Lib. </p>
  
  <p>This is the Error <code>ArgumentException: The Assembly System.Threading.Tasks is referenced by Tweetinvi ('Assets/Plugins/Tweetinvi.dll'). But the dll is not allowed to be included or could not be found.</code></p>
  
  <p>I'm Using Unity 2017.2 and my Player Settigns are > .NET 4.6
  The TweetInvi.dll Is Inside my Plugins Folder</p>
  
  <p>Anyone has any soulution?</p>