Audio issue - using MonoGame.WpfCore

Trying to use MonoGame.WpfCore by craftworkgames, but can’t get the audio to work in monogame embedded in WPF-app:

SoundEffect _sound = null;
SoundEffectInstance _soundSpil;

It gives me the error below:

System.TypeLoadException
HResult=0x80131522
Message=Could not load type ‘SharpDX.ComObjectCallback’ from assembly ‘SharpDX, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b4dcf0f35e5521f1’.
Source=MonoGame.Framework
StackTrace:
at Microsoft.Xna.Framework.Audio.SoundEffectInstance.PlatformDispose(Boolean disposing)
at Microsoft.Xna.Framework.Audio.SoundEffectInstance.Dispose(Boolean disposing)
at Microsoft.Xna.Framework.Audio.SoundEffectInstance.Finalize()

And I’ve tried to use the type Song and play via -
MediaPlayer.Play(song);

But exception is thrown:
InvalidCastException: Unable to cast object of type ‘Callback’ to type ‘SharpDX.IUnknown’

Anyone know if its possible to get the audio to play?