How to enter Hardwarekey"enter" KeyValue

Hi, thanks in advance to this post reply.

I’d like to make a tablet application using hardware Keyboard.

when I previewed on Android Tablet, the Monitor got error like this

LOG: Uno.NullReferenceException: Object reference was null
       at Fuse.Navigation.Router.GoUp()
       at Fuse.Navigation.Router.GoBack()
       at Fuse.Navigation.Router.OnKeyPressed(object,Fuse.Input.KeyEventArgs)
       at Fuse.Input.KeyPressed.Invoke(Fuse.Input.KeyPressedHandler,object,Fuse.Input.KeyPressedArgs)
       at Fuse.VisualEvent`2.InvokeInternal(THandler,object,TArgs)
       at Fuse.VisualEvent`2.InvokeGlobalHandlers(Fuse.Visual,TArgs)
       at Fuse.VisualEvent`2.Raise(TArgs,Fuse.VisualEventMode,bool,[Uno.Action<TArgs, Uno.Collections.IList<Fuse.Visual>>])
       at Fuse.VisualEvent`2.RaiseWithBubble(TArgs,[Fuse.VisualEventMode])
       at Fuse.Input.Keyboard.RaiseKeyPressed(Uno.Platform.Key,bool,bool,bool,bool)
       at Fuse.KeyboardBootstrapper.OnKeyPressed(object,Uno.Platform.KeyEventArgs)
       at Uno.Platform.EventSources.HardwareKeys.OnKeyDown(Uno.Platform.Key,Uno.Platform.EventModifiers)
ERROR: Object reference was null
    Uno.NullReferenceException occured.
       at Fuse.Navigation.Router.GoUp()
       at Fuse.Navigation.Router.GoBack()
       at Fuse.Navigation.Router.OnKeyPressed(object,Fuse.Input.KeyEventArgs)
       at Fuse.Input.KeyPressed.Invoke(Fuse.Input.KeyPressedHandler,object,Fuse.Input.KeyPressedArgs)
       at Fuse.VisualEvent`2.InvokeInternal(THandler,object,TArgs)
       at Fuse.VisualEvent`2.InvokeGlobalHandlers(Fuse.Visual,TArgs)
       at Fuse.VisualEvent`2.Raise(TArgs,Fuse.VisualEventMode,bool,[Uno.Action<TArgs, Uno.Collections.IList<Fuse.Visual>>])
       at Fuse.VisualEvent`2.RaiseWithBubble(TArgs,[Fuse.VisualEventMode])
       at Fuse.Input.Keyboard.RaiseKeyPressed(Uno.Platform.Key,bool,bool,bool,bool)
       at Fuse.KeyboardBootstrapper.OnKeyPressed(object,Uno.Platform.KeyEventArgs)
       at Uno.Platform.EventSources.HardwareKeys.OnKeyDown(Uno.Platform.Key,Uno.Platform.EventModifiers)

I think I need to code Uno. Is there any code to help me?