title: Xamarin Forms/Andriod file picker plugin exception
body: <p>I'm using <a href="https://www.nuget.org/packages/Xamarin.Plugin.FilePicker/" rel="nofollow noreferrer">Xamarin.Plugin.FilePicker</a> Plugin Latest version 2.1.18 <br /><br />
  I follow all instruction and check for <strong><em>WriteExternalStorage</em></strong> and <strong><em>ReadExternalStorage</em></strong> Permissions before call <code>PickFile</code> method </p>
  
  <pre><code>var fileData = await CrossFilePicker.Current.PickFile();
  </code></pre>
  
  <p>It works at first and open the file picker dialog after i choose any file <br/>
  the following error occur </p>
  
  <blockquote>
    <p>Unhandled Exception:</p>
    
    <p>System.MissingMethodException: string[]
    string.Split(char,System.StringSplitOptions) occurred</p>
  </blockquote>