Designer showing: Invalid Xaml

Question

Hello I have to examples where the deployed code works without any error, but the designer complaints.

My search around for this type of error refers to the fact that the project name has "spaces" or old versions of the phone.controls. Neither are the issue for me. I am therefore thinking it might be a change in template structure ? I have 3 examples both giving the error:

Example 1

<ListBox Canvas.ZIndex="1001" Grid.Row="0" x:Name="ColorPickerListBox" ItemsSource="{Binding ColorList}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Button BorderBrush="Transparent" BorderThickness="0" Command="{Binding DataContext.ChangeColourCommand, ElementName=ColorPickerListBox}" CommandParameter="{Binding}">
                        <Button.Template>
                            <ControlTemplate>
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="50"/>
                                        <ColumnDefinition Width="50"/>
                                    </Grid.ColumnDefinitions>
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="50"/>
                                        <RowDefinition Height="10"/>
                                    </Grid.RowDefinitions>
                                    <Rectangle Grid.Column="0" Fill="{Binding color}">

                                    </Rectangle>
                                    <TextBlock Text="{Binding name}" TextWrapping="Wrap" TextAlignment="Center" VerticalAlignment="Center" Grid.Column="1" FontSize="10"/>
                                </Grid>
                            </ControlTemplate>
                        </Button.Template>
                    </Button>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

Example 2

<View:CanvasItemsControl ItemsSource="{Binding DecorationOnShield}">
            <View:CanvasItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <Canvas/>
                </ItemsPanelTemplate>
            </View:CanvasItemsControl.ItemsPanel>
        </View:CanvasItemsControl>

Example 3

<ControlTemplate TargetType="Button">
                    <Grid Background="Transparent">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal"/>
                                <VisualState x:Name="MouseOver"/>
                                <VisualState x:Name="Pressed">
                                    <Storyboard>
                                        <ColorAnimation Duration="0" To="#FFFFE5CD" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" Storyboard.TargetName="Path_6" d:IsOptimized="True"/>
                                        <ColorAnimation Duration="0" To="#FFFFE5CD" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" Storyboard.TargetName="Rectangle_7" d:IsOptimized="True"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Disabled"/>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Viewbox Margin="-10,0" RenderTransformOrigin="0.5,0.5">
                            <Viewbox.RenderTransform>
                                <CompositeTransform ScaleX="-1"/>
                            </Viewbox.RenderTransform>
                            <Grid Height="60" Width="109">
                                <Viewbox x:Name="Group" Width="108.952" Height="60.3575">
                                    <Viewbox Height="49" Width="103">
                                        <Grid Height="58.5920524596841" Width="114.358690261841">
                                            <Viewbox x:Name="Group1" Width="107.672" Height="16.0729" Margin="0,43,6,0">
                                                <Canvas Width="107.672" Height="16.0729">
                                                    <Rectangle x:Name="Rectangle1" Width="83.1734" Height="14.4729" Canvas.Left="15.6519" Canvas.Top="0.799988" Stretch="Fill" Fill="#FF733800"/>
                                                    <Path x:Name="Path1" Width="36.1823" Height="4.64556" Canvas.Left="14.9854" Canvas.Top="6.83045" Stretch="Fill" StrokeThickness="0.640004" StrokeLineJoin="Round" Stroke="#FFB65900" Data="F1 M 15.3054,8.42395C 18.6213,8.42395 25.7329,8.47461 28.5751,8.03607C 31.4174,7.59753 51.3131,6.0625 50.8394,8.47473C 50.3657,10.8868 45.1549,11.3254 38.523,11.1061C 31.8911,10.8868 30.6373,10.33 15.4787,10.33"/>
                                                    <Path x:Name="Path_15" Width="39.3557" Height="7.28494" Canvas.Left="15.1587" Canvas.Top="5.56275" Stretch="Fill" StrokeThickness="0.640004" StrokeLineJoin="Round" Stroke="#FF4A2500" Data="F1 M 15.4787,7.21094C 22.1106,7.21094 29.0489,7.15894 33.7859,6.28186C 38.523,5.40466 55.1028,5.84326 54.1553,8.91327C 53.2079,11.9833 40.8915,12.8604 31.4174,12.4218C 21.9432,11.9833 23.058,11.4968 15.4787,11.7162"/>
                                                    <Path x:Name="Path_18" Width="42.4594" Height="9.32969" Canvas.Left="15.3319" Canvas.Top="4.50856" Stretch="Fill" StrokeThickness="0.640004" StrokeLineJoin="Round" Stroke="#FFB65900" Data="F1 M 15.6519,5.47815C 23.705,5.25891 40.4178,4.52753 46.1023,4.96606C 51.7868,5.40466 57.4713,6.93964 57.4713,8.69397C 57.4713,10.4482 48.4709,13.5182 43.2601,13.5182C 38.0492,13.5183 18.9679,12.7558 15.6519,12.7559"/>
                                                    <Path x:Name="Path_20" Width="6.85588" Height="2.21011" Canvas.Left="39.0928" Canvas.Top="7.91791" Stretch="Fill" StrokeThickness="0.640004" StrokeLineJoin="Round" Stroke="#FFB65900" Fill="#FF5B2D00" Data="F1 M 45.6287,9.57123C 45.6288,9.57123 44.3729,8.36206 43.7438,8.25555C 43.1148,8.14893 38.8722,8.53601 39.4705,9.13269C 40.0687,9.72943 45.598,10.0614 45.6287,9.57123 Z "/>
                                                    <Path x:Name="Path_21" Width="6.85587" Height="2.2101" Canvas.Left="63.2515" Canvas.Top="7.03786" Stretch="Fill" StrokeThickness="0.640004" StrokeLineJoin="Round" Stroke="#FFB65900" Fill="#FF5B2D00" Data="F1 M 69.7874,8.69116C 69.7874,8.69116 68.5316,7.48206 67.9025,7.37549C 67.2735,7.26892 63.0309,7.65594 63.6292,8.25262C 64.2274,8.84937 69.7567,9.18134 69.7874,8.69116 Z "/>
                                                    <Path x:Name="Path_22" Width="14.1696" Height="4.74651" Canvas.Left="59.8778" Canvas.Top="5.80243" Stretch="Fill" StrokeThickness="0.640004" StrokeLineJoin="Round" Stroke="#FF5B2D00" Data="F1 M 65.998,10.2289C 64.5,10.229 59.3661,8.91327 60.3135,8.03607C 61.2609,7.15894 67.4192,5.62396 68.8403,6.28186C 70.2614,6.9397 74.5823,7.4801 73.5773,8.25537C 72.1562,9.35181 67.4191,10.229 65.998,10.2289 Z "/>
                                                    <Path x:Name="Path_23" Width="20.0949" Height="6.93487" Canvas.Left="58.0987" Canvas.Top="4.49127" Stretch="Fill" StrokeThickness="0.640004" StrokeLineJoin="Round" Stroke="#FFB65900" Data="F1 M 59.3661,5.62396C 61.0383,5.10791 65.0507,4.52753 69.314,4.96606C 73.5773,5.40466 78.3145,7.15894 77.8407,7.81683C 77.367,8.47473 72.1563,11.1061 69.7877,11.1061C 67.4191,11.1061 59.3661,10.4482 58.8924,9.79041C 58.4187,9.13251 57.945,6.06262 59.3661,5.62396 Z "/>
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                                                    <Path x:Name="Path_31" Width="37.257" Height="4.25" Canvas.Left="61.8884" Canvas.Top="11.1232" Stretch="Fill" StrokeThickness="0.640004" StrokeLineJoin="Round" Stroke="#FF4A2500" Data="F1 M 62.2084,15.0532C 62.2084,15.0532 71.2088,13.9568 76.4196,13.0797C 81.6304,12.2026 93.1409,11.1044 98.8254,11.543"/>
                                                    <Path x:Name="Path_32" Width="13.0979" Height="2.68285" Canvas.Left="86.0475" Canvas.Top="13.129" Stretch="Fill" StrokeThickness="0.640004" StrokeLineJoin="Round" Stroke="#FFB65900" Data="F1 M 86.3675,15.4918C 86.3675,15.4918 90.2987,13.4489 98.8254,13.449"/>
                                                    <Rectangle x:Name="Rectangle_1" Width="84.9467" Height="16.0729" Canvas.Left="14.6786" Canvas.Top="-1.01924e-005" Stretch="Fill" StrokeThickness="1.6" StrokeLineJoin="Round" Stroke="#FF000000"/>
                                                </Canvas>
                                            </Viewbox>
                                            <Viewbox x:Name="Group_16" Width="107.672" Height="16.0728" Margin="0,28,6,15">
                                                <Canvas Width="107.672" Height="16.0728">
                                                    <Rectangle x:Name="Rectangle_17" Width="83.1734" Height="14.4729" Canvas.Left="15.6519" Canvas.Top="0.799927" Stretch="Fill" Fill="#FF733800"/>
                                                    <Path x:Name="Path_33" Width="36.1823" Height="4.64552" Canvas.Left="14.9854" Canvas.Top="6.83047" Stretch="Fill" StrokeThickness="0.640004" StrokeLineJoin="Round" Stroke="#FFB65900" Data="F1 M 15.3054,8.42389C 18.6213,8.42389 25.7329,8.47461 28.5751,8.03613C 31.4174,7.59753 51.3131,6.06256 50.8394,8.47467C 50.3657,10.8868 45.1549,11.3254 38.523,11.1061C 31.8911,10.8868 30.6373,10.33 15.4787,10.33"/>
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                                                </Canvas>
                                            </Viewbox>
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Another Project

Using the above code in other projects does not always give the same error, adding to the wonder of the error.

Tried to create a completely new project and only reusing the code, but the invalid xaml persists. But still compiles and deploys fine :/

Initial Solution

We have used a package from NuGet, about blend.expression.sdk, this package introduces the errors. But it was needed since one of the computers does not receive the references during install of blend or visual studio.

Answer 1

In my experience with Visual Studio 2013/15 the XAML designer, seemingly at random, will throw an "Invalid Markup" message or simply never load -- despite the application compiling and running perfectly well.

Restarting Visual Studio has always fixed this problem for me.

If the designer won't display a preview after a restart... I recommend commenting out elements from your markup until it succeeds. Or, alternatively, create a new, blank page which previews correctly and add one element at a time until it either 1) matches one of your examples or 2) suddenly fails (in which case you've found the offending element).