xamarin forms Xamarin.Forms.Xaml.XamlParseException: Timeout exceeded getting exception details

I try to add image to StackLayout via XAML:

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:App1;assembly=App1"
             x:Class="App1.MainPage">
    <RelativeLayout BackgroundColor="White">
        <StackLayout Orientation="Horizontal" WidthRequest="1024" HorizontalOptions="Start" BackgroundColor="Magenta">
            <Button BackgroundColor="Transparent" WidthRequest="50" BorderColor="Transparent" Image="menu.png">
            </Button>
            <Image Source="{local:ImageResource App1.Images.icon1.png}"/>
        </StackLayout>
    </RelativeLayout>
</ContentPage>

In this project I've added class for loading resource:

class ImageResourceExtention : IMarkupExtension
    {
        public string Source { get; set; }
        public object ProvideValue(IServiceProvider serviceProvider)
        {
            if (Source == null)
            {
                return null;
            }
            var imageSource = ImageSource.FromResource(Source);
            return imageSource;
        }
    }

Also in this project I've added icon1.png as Embedded Resource into Images folder.
Project name and assembly name are equal (App1).
Solution builds without problem but when I run application I get this error:

"Xamarin.Forms.Xaml.XamlParseException: <Timeout exceeded getting exception details>"

Where did I do mistake? Please help me, I'm beginner at xamarin