using System.Threading.Tasks;
using Windows.ApplicationModel.Activation;

namespace Sample
{
    sealed partial class App : Template10.Common.BootStrapper
    {
        public App()
        {
            InitializeComponent();
        }

        public override async Task OnStartAsync(StartKind startKind, IActivatedEventArgs args)
        {
            NavigationService.Navigate(typeof(Views.MainPage));
            await Task.Yield();
        }
    }
}


using System.Threading.Tasks;
using Windows.ApplicationModel.Activation;

namespace Sample
{
    sealed partial class App : Template10.Common.BootStrapper
    {
        public App()
        {
            InitializeComponent();
        }

        public override Task OnStartAsync(StartKind startKind, IActivatedEventArgs args)
        {
            NavigationService.Navigate(typeof(Views.MainPage));
			return Task.CompletedTask;
		}
    }
}


Replace another Task.Yield with Task.CompletedTask.
Replace another Task.Yield with Task.CompletedTask.
