ListView lỗi khai báo sử dụng class

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Trên visual 2013 sử dụng book.cs thì xài bình thường, bên 2015 thì gặp lỗi
Xaml:

<Page
    x:Class="DEMOlistview.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:DEMOlistview"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    **xmlns:data ="using:DemoDataBinding"**
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <ListView x:Name="listView" HorizontalAlignment="Left" Height="377" Margin="10,105,0,0" VerticalAlignment="Top" Width="auto">
            <ListView.ItemTemplate>
                <DataTemplate **x:DataType="data:Book"**>
                    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
                        <Image Width="150" Source="{x:Bind CoverImage }" HorizontalAlignment="Center"></Image>
                        <StackPanel Margin="20,20,0,0">
                            <TextBlock FontSize="18" Text="{x:Bind Title}" HorizontalAlignment="Right"></TextBlock>
                            <TextBlock FontSize="10" Text="{x:Bind Author }" HorizontalAlignment="Right"></TextBlock>
                        </StackPanel>
                    </StackPanel>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>

    </Grid>
</Page>