Doesn't work for Avalonia 0.8

[ForNeVeR]

See this project: https://github.com/minaew/HelloAvaloniaWorld

[ForNeVeR]

Also, we're supposed to show an error message for such cases (and I can see that a corresponding exception, AvaloniaPreviewerInitializationException, has been thrown), but there's only endless progress bar spinning. Not friendly.