Getting Error when attempting to use StateContainer in Maui

[ciara-kyles-williams]

Hello,

I'm currently working on updating a Xamarin.Forms project to .NET MAUI. I am getting the following error when attempting to run the project:

View for None not defined.

I don't have a state named "None" and have not bound any view to that state, see below:

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui" 
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:viewModels="clr-namespace:YarnCatMaui.ViewModels"
             x:Class="YarnCatMaui.Views.AuthenticationView"
             xmlns:xct="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
             xmlns:common="clr-namespace:YarnCatMaui.Views.Common"
             xmlns:states="clr-namespace:YarnCatMaui.Common"
             x:DataType="viewModels:AuthenticationViewModel"
             xmlns:ios="clr-namespace:Microsoft.Maui.Controls.PlatformConfiguration.iOSSpecific;assembly=Microsoft.Maui.Controls"
             Shell.PresentationMode="ModalAnimated"
             BackgroundColor="{AppThemeBinding Light={StaticResource DayBackgroundColor}, Dark={StaticResource NightBackgroundColor}}"
             ios:Page.UseSafeArea="True"
             Shell.NavBarIsVisible="False"
             x:Name="authView">
    <ContentPage.Content>
        <StackLayout
            Padding="0"
            HorizontalOptions="FillAndExpand"
            VerticalOptions="FillAndExpand"
            xct:StateContainer.CurrentState="{Binding CurrentState}">
            <xct:StateContainer.StateViews>
                <common:ErrorView
                        VerticalOptions="FillAndExpand"
                        xct:StateContainer.CurrentState="Error"></common:ErrorView>
                <common:LoadingView
                        VerticalOptions="FillAndExpand"
                        xct:StateContainer.CurrentState="Loading"
                        LoadingText="Logging in"></common:LoadingView>
            </xct:StateContainer.StateViews>
            <Grid
                HorizontalOptions="FillAndExpand"
                VerticalOptions="FillAndExpand"
                BackgroundColor="{AppThemeBinding Light={StaticResource DayBackgroundColor}, Dark={StaticResource NightBackgroundColor}}"
                RowDefinitions="*, auto, auto, auto">
                <Image
                    Grid.Row="0"
                    Aspect="AspectFill"
                    Source="authcollage.png"
                    HorizontalOptions="EndAndExpand"
                    Margin="0" />
                <Label
                    Grid.Row="1"
                    HorizontalTextAlignment="Center"
                    Margin="30,20,30,10"
                    Text="Manage your Ravelry stash&#x0a;and projects in one place"
                    Style="{OnIdiom Phone={StaticResource Headline5_MulishBold}, Tablet={StaticResource Headline4_MulishBold}}"
                    TextColor="{AppThemeBinding Light={StaticResource DayPrimaryDarkColor}, Dark={StaticResource NightPrimaryColor}}"/>
                <Label
                    Grid.Row="2"
                    HorizontalTextAlignment="Center"
                    Margin="0,0,0,30"
                    Style="{OnIdiom Phone={StaticResource Body1}, Tablet={StaticResource Headline5_Mulish}}"
                    Text="Get started with the YarnCat app"
                    TextColor="{AppThemeBinding Light={StaticResource DayOnSurfaceColor}, Dark={StaticResource NightOnSurfaceColor}}" />
                <Button
                    Grid.Row="3"
                    Command="{Binding AuthCommand}"
                    Margin="0,0,0,30"
                    HorizontalOptions="Center"
                    AutomationProperties.HelpText="Connect your Ravelry account to use the app"
                    Style="{x:StaticResource ProminentButtonStyle}"
                    Text="LOGIN TO RAVELRY"
                    VerticalOptions="End" />
            </Grid>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

I have no idea why this is happening, and need some help. Thank you!

[ciara-kyles-williams]

This is a user error; I had logic from the previous iteration of this using an enumeration value of "None", which became the default.