WinRT 8.1 crash on Init(e) on Xamarin.Forms 1.5.*

Hi. I have used Xamarin.Forms on Android, WP8.0 and WinRT8.1
When I upgraded Xamarin.Forms from 1.4 to 1.5 WinRTstop working.

I got this error when calling Xamarin.Forms.Forms.Init(e):
Error HRESULT E_FAIL has been returned from a call to a COM component.

at Windows.UI.Xaml.ResourceDictionary.put_Source(Uri value)
at Xamarin.Forms.Forms.GetTabletResources()
at Xamarin.Forms.Forms.Init(LaunchActivatedEventArgs launchActivatedEventArgs)
at BLABLABLA_Windows8.App.OnLaunched(LaunchActivatedEventArgs e)

Running on Windows 8.1 with Visual Studio 2015.
And targeting WinRT8.1 (Same error on Debug/Release, x86/x64)

Anyone that has the same issue? Any ideas to get this work?
Thanks