Allowed ErrorWindow to close properly.

PcgsInvUi/Views/ErrorWindow.axaml.cs

@@ -1,5 +1,7 @@
+using System;
 using Avalonia.ReactiveUI;
 using PcgsInvUi.ViewModels;
+using ReactiveUI;
 
 namespace PcgsInvUi.Views; 
 
@@ -7,5 +9,6 @@ public partial class ErrorWindow : ReactiveWindow<ErrorWindowViewModel> {
     public ErrorWindow()
     {
         InitializeComponent();
+        this.WhenActivated(d => d(ViewModel!.CloseCommand.Subscribe(Close)));
     }
-}
+}