Collection page appstudio not view offline where is the error? help

using System;
using System.Net.NetworkInformation;
using Windows.ApplicationModel.DataTransfer;
using Windows.UI.ViewManagement;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;
using AppStudio.Services;
using AppStudio.ViewModels;
namespace AppStudio.Views
    public sealed partial class GaudiosiPage : Page
        private NavigationHelper _navigationHelper;
        private DataTransferManager _dataTransferManager;
        public GaudiosiPage()
            this.InitializeComponent();
            _navigationHelper = new NavigationHelper(this);
            GaudiosiModel = new GaudiosiViewModel();
            DataContext = this;
            ApplicationView.GetForCurrentView().
                SetDesiredBoundsMode(ApplicationViewBoundsMode.UseVisible);
        public GaudiosiViewModel GaudiosiModel { get; private set; }
        public NavigationHelper NavigationHelper
            get { return _navigationHelper; }
        protected override async void OnNavigatedTo(NavigationEventArgs e)
            _dataTransferManager = DataTransferManager.GetForCurrentView();
            _dataTransferManager.DataRequested += OnDataRequested;
            _navigationHelper.OnNavigatedTo(e);
            await GaudiosiModel.LoadItemsAsync();
        protected override void OnNavigatedFrom(NavigationEventArgs e)
            _navigationHelper.OnNavigatedFrom(e);
            _dataTransferManager.DataRequested -= OnDataRequested;
        private void OnDataRequested(DataTransferManager sender, DataRequestedEventArgs args)
            if (GaudiosiModel != null)
                GaudiosiModel.GetShareContent(args.Request);

using System;
using System.Net.NetworkInformation;
using Windows.ApplicationModel.DataTransfer;
using Windows.UI.ViewManagement;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;
using AppStudio.Services;
using AppStudio.ViewModels;
namespace AppStudio.Views
    public sealed partial class GaudiosiPage : Page
        private NavigationHelper _navigationHelper;
        private DataTransferManager _dataTransferManager;
        public GaudiosiPage()
            this.InitializeComponent();
            _navigationHelper = new NavigationHelper(this);
            GaudiosiModel = new GaudiosiViewModel();
            DataContext = this;
            ApplicationView.GetForCurrentView().
                SetDesiredBoundsMode(ApplicationViewBoundsMode.UseVisible);
        public GaudiosiViewModel GaudiosiModel { get; private set; }
        public NavigationHelper NavigationHelper
            get { return _navigationHelper; }
        protected override async void OnNavigatedTo(NavigationEventArgs e)
            _dataTransferManager = DataTransferManager.GetForCurrentView();
            _dataTransferManager.DataRequested += OnDataRequested;
            _navigationHelper.OnNavigatedTo(e);
            await GaudiosiModel.LoadItemsAsync();
        protected override void OnNavigatedFrom(NavigationEventArgs e)
            _navigationHelper.OnNavigatedFrom(e);
            _dataTransferManager.DataRequested -= OnDataRequested;
        private void OnDataRequested(DataTransferManager sender, DataRequestedEventArgs args)
            if (GaudiosiModel != null)
                GaudiosiModel.GetShareContent(args.Request);

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