NullReference when Show a MvxTabBarViewController mvvmcross ios - ios

Question

I have a storyboard made on xCode, and know I'm working on visual studio with Xamarin and mvvmcross, to do the IOS and the Android app with the same Core.
My StoryBoard have some views (including a SideBar on some of the initial views) that will open 4 views that will call ShowViewModel for a MvxTabBarViewController, and each one of that view will open a different tab.
All the Navigation to that 4 view, its done, now I have problems Showing the Tab Bar...
When I try to do a simple test of call ShowViewModel to MvxTabBarViewController and open a specific tab, on the ViewDidLoad of that tab, I have the error
System.NullReferenceException: Object reference not set to an instance
of an object
The structure of my Tab bar was all created on the storyboard.
Here is the code of my TabBarController:
[MvxFromStoryboard("Main")]
[MvxSidebarPresentation(MvxPanelEnum.Center, MvxPanelHintType.PushPanel, true)]
public partial class TabDetailView : MvxTabBarViewController<TabDetailViewModel>
{
private bool _constructed;
public TabDetailView(IntPtr handle) : base(handle)
{
_constructed = true;
// need this additional call to ViewDidLoad because UIkit creates the view before the C# hierarchy has been constructed
ViewDidLoad();
}
public TabDetailView()
{
_constructed = true;
// need this additional call to ViewDidLoad because UIkit creates the view before the C# hierarchy has been constructed
ViewDidLoad();
}
public override void ViewDidLoad()
{
if (!_constructed)
return;
base.ViewDidLoad();
var vm = (TabDetailViewModel)this.ViewModel;
if (vm == null)
return;
}
}
And Here is the code of my ViewController corresponding to the Tab that I want to open:
[MvxFromStoryboard("Main")]
[MvxSidebarPresentation(MvxPanelEnum.Center, MvxPanelHintType.PushPanel, true)]
public partial class TabDiaryView : MvxViewController<TabDiaryViewModel>
{
public TabDiaryView (IntPtr handle) : base (handle)
{
}
public override void ViewDidLoad()
{
base.ViewDidLoad(); //HERE IS THE ERROR (NULLREFERENCE)
}
}
public class Setup : MvxIosSetup
{
public Setup(MvxApplicationDelegate applicationDelegate, UIWindow window)
: base(applicationDelegate, window)
{
}
public Setup(MvxApplicationDelegate applicationDelegate, IMvxIosViewPresenter presenter)
: base(applicationDelegate, presenter)
{
}
protected override IMvxApplication CreateApp()
{
return new Core.App();
}
protected override IMvxTrace CreateDebugTrace()
{
return new DebugTrace();
}
protected override IMvxIosViewPresenter CreatePresenter()
{
return new MvxSidebarPresenter((MvxApplicationDelegate)ApplicationDelegate, Window);
}
}
Please help me!!