无法启动APP,该怎么处理

<Page
    x:Class="Triggers测试.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Triggers测试"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
        </Grid.RowDefinitions>
        
        <Rectangle x:Name="rectangle1" Grid.Row="0" Fill="Blue" Width="100" Height="100" VerticalAlignment="Top">
            <Rectangle.Triggers>
                <EventTrigger RoutedEvent="Page.Loaded"> <!-- 页面加载时自动动画 -->
                    <BeginStoryboard>
                        <Storyboard AutoReverse="True" RepeatBehavior="Forever">
                            <DoubleAnimation Storyboard.TargetName="rectangle1" Storyboard.TargetProperty="Height"
                                From="10" To="600" Duration="0:0:10"></DoubleAnimation>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Rectangle.Triggers>
        </Rectangle>
    </Grid>
</Page>