xamarin.forms - Xamarin.Forms FreshMVVM

Question

I'm using FreshMVVM to make a tabbed in Xamarin Forms app ,I'm also using FlowListView plugin, I added two empty pages with their pagesModel but when I'm testing the app I faced this unhandled exception , any help ? this is a screen shot of the error

public App()
    {
        InitializeComponent();
        FlowListView.Init();
        FreshIOC.Container.Register<IDatabaseService, DatabaseService>();
     SetupPage();


    }

    void SetupPage()
    {

        var freshTab = new FreshTabbedNavigationContainer();
        freshTab.AddTab<NewProductsPageModel>("New", "document.png", null);//Unhandled exception here! 
        freshTab.AddTab<AllProductsPageModel>("All", "document.png", null);
        MainPage = freshTab;    
    }