title: Xamarin.Forms System.ArgumentException: Illegal characters in path
body: <p>I am brand new to Xamarin.Forms projects.  I have created a project with VS2019 which has not been modified in any way, added a Pixel 2 Pie 9.0 - Api 28 emulator within the Android Device Manager.  When I try to run the project on the android emulator, I am unable to run my app, with the following exception in my error list:</p>
  
  <pre><code>Error       XARDF7004: System.ArgumentException: Illegal characters in path.
     at System.Security.Permissions.FileIOPermission.EmulateFileIOPermissionChecks(String fullPath)
     at System.Security.Permissions.FileIOPermission.QuickDemand(FileIOPermissionAccess access, String fullPath, Boolean checkForDuplicates, Boolean needFullPath)
     at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive, Boolean checkHost)
     at Xamarin.Android.Tasks.RemoveDirFixed.RunTask()
     at Xamarin.Android.Tasks.AndroidTask.Execute()   
  </code></pre>
  
  <p>Since I am simply using a basic project template generated by VS2019, this has to be a bug on Microsofts end.  How can I fix their error?</p>