ShowErrorWindow now actually shows the ErrorWindow

PcgsInvUi/Views/ErrorWindow.axaml

@@ -0,0 +1,13 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:viewModels="clr-namespace:PcgsInvUi.ViewModels"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="PcgsInvUi.Views.ErrorWindow" x:DataType="viewModels:ErrorWindowViewModel"
+        Title="ErrorWindow">
+    <Grid RowDefinitions="2">
+        <TextBlock Text="{Binding DisplayedException.Message}" />
+        <Button Content="OK" Command="{Binding CloseCommand}" />
+    </Grid>
+</Window>

PcgsInvUi/Views/ErrorWindow.axaml.cs

@@ -0,0 +1,11 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace PcgsInvUi.Views; 
+
+public partial class ErrorWindow : Window {
+    public ErrorWindow() {
+        InitializeComponent();
+    }
+}

PcgsInvUi/Views/MainWindow.axaml.cs

@@ -14,6 +14,7 @@ public partial class MainWindow : ReactiveWindow<MainWindowViewModel> {
         InitializeComponent();
         this.WhenActivated(d => d(ViewModel!.ShowDeleteWindow.RegisterHandler(ShowDeleteWindowAsync)));
         this.WhenActivated(d => d(ViewModel!.ShowExportWindow.RegisterHandler(ShowFilePickerAsync)));
+        this.WhenActivated(d => d(ViewModel!.ShowErrorWindow.RegisterHandler(ShowErrorWindowAsync)));
         // this.WhenActivated(d => d(ViewModel!.ShowFindWindow.RegisterHandler(ShowFindWindowAsync)));
     }
 
@@ -54,7 +55,7 @@ public partial class MainWindow : ReactiveWindow<MainWindowViewModel> {
         }
     }
     
-    public async Task ShowErrorWindowAsync(InteractionContext<Unit, Unit> interaction) {
+    public async Task ShowErrorWindowAsync(InteractionContext<ErrorWindowViewModel, Unit> interaction) {
         var window = new ErrorWindow();
         window.DataContext = interaction.Input;