I'm using a very simple example to play media using MediaPlayer class in UWP application. But I'm getting an error when calling its constructor. 

```
MediaPlayer _mediaPlayer = new MediaPlayer(); // error over here
_mediaPlayer.Source = MediaSource.CreateFromUri(new Uri("ms-appx:///Assets/example_video.mkv"));
_mediaPlayer.Play();

```

error is : MediaPlayer doent contain a constructor that takes 0 argument

what has gone wrong?