title: What causes "unrecognized selector sent to class" error on Xamarin Forms build?
body: <p>A few things about my system first:</p>
  
  <ul>
  <li>Mac OS version 10.13.6</li>
  <li>Xcode version 10</li>
  <li>Visual Studio for mac 7.6.6</li>
  </ul>
  
  <p>I'm completely new to Xamarin forms and want to play around and learn. All I'm trying to do is simply create a new xamarin forms solution and get it to build.</p>
  
  <p>Here are the steps I went through:</p>
  
  <ul>
  <li>create new project</li>
  <li>choose "blank forms app" in C# from the app submenu of multplatform</li>
  <li>target platforms both Andriod and iOs; shared code .NET Standard</li>
  <li>don't bother with version control or app centre test (unticked)</li>
  </ul>
  
  <p>Here is the error:</p>
  
  <p><a href="https://github.com/benfranklin79/shared/blob/master/20180919/error.txt" rel="nofollow noreferrer">https://github.com/benfranklin79/shared/blob/master/20180919/error.txt</a></p>
  
  <p>Here is a link to the solution:</p>
  
  <p><a href="https://github.com/benfranklin79/shared/tree/master/20180919/test" rel="nofollow noreferrer">https://github.com/benfranklin79/shared/tree/master/20180919/test</a></p>
  
  <p>Also here are more detailed visual studio specs</p>
  
  <p><a href="https://github.com/benfranklin79/shared/blob/master/20180919/vs_specs.txt" rel="nofollow noreferrer">https://github.com/benfranklin79/shared/blob/master/20180919/vs_specs.txt</a></p>