Name of this element

Why is there no forward slash for the last StackPanel tag? I get these errors but I'm can't see what's wrong (except for that possibly).

<Page
    x:Name="pageRoot"
    x:Class="Exits_Expert_London.Emirates_Greenwich_Peninsula"
    DataContext="{Binding DefaultViewModel, RelativeSource={RelativeSource Self}}"
    xmlns="http://ift.tt/w9rHWX;
    xmlns:x="http://ift.tt/zZkFEV;
    xmlns:local="using:Exits_Expert_London"
    xmlns:common="using:Exits_Expert_London.Common"
    xmlns:d="http://ift.tt/PuXO1J;
    xmlns:mc="http://ift.tt/R4RR6u;
    mc:Ignorable="d">

    <Page.Resources>
        <!-- TODO: Delete this line if the key AppName is declared in App.xaml -->
        <x:String x:Key="AppName">My Application</x:String>
    </Page.Resources>

    <!--
        This grid acts as a root panel for the page that defines two rows:
        * Row 0 contains the back button and page title
        * Row 1 contains the rest of the page layout
    -->
    <Grid Background="#FFC2142D">
        <Grid.ChildrenTransitions>
            <TransitionCollection>
                <EntranceThemeTransition/>
            </TransitionCollection>
        </Grid.ChildrenTransitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="140"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!-- Back button and page title -->
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="120"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Button x:Name="backButton" Margin="39,59,39,0" Command="{Binding NavigationHelper.GoBackCommand, ElementName=pageRoot}"
                        Style="{StaticResource NavigationBackButtonNormalStyle}"
                        VerticalAlignment="Top"
                        AutomationProperties.Name="Back"
                        AutomationProperties.AutomationId="BackButton"
                        AutomationProperties.ItemType="Navigation Button"/>
            <TextBlock x:Name="pageTitle" Text="Page Title" Style="{StaticResource HeaderTextBlockStyle}" Grid.Column="1" 
                        IsHitTestVisible="false" TextWrapping="NoWrap" VerticalAlignment="Bottom" Margin="0,0,30,40" Foreground="White"/>
        </Grid>
        <Grid Grid.Row="1">
            <ScrollViewer>
                <StackPanel Orientation="Horizontal">
                    <!-- group starts here -->
                    <StackPanel>
                        <TextBlock Text="Group x"/>
                        <WrapGrid>
                            <!-- put grouped items here.  -->
                        </WrapGrid>
                    </StackPanel>
                    <!-- group ends right above this line -->

                    <!-- group starts here -->
                    <StackPanel>
                        <TextBlock Text="Group x"/>
                        <WrapGrid>
                            <!-- put grouped items here.  -->
                        </WrapGrid>
                    </StackPanel>
                    <!-- group ends right above this line -->
                </StackPanel>
            </ScrollViewer>
        </Grid>
    </Grid>
</Page>