Fix error dialog

JWLMerge/AppCenterInit.cs

@@ -8,6 +8,7 @@ namespace JWLMerge;
 
 internal static class AppCenterInit
 {
+    // Please omit this token (or use your own) if you are building a fork
     private static readonly string? TheToken = "2a948a7a-4933-4e7d-9ba0-90e071b71e39";
 
     public static void Execute()

JWLMerge/Services/DialogService.cs

@@ -56,6 +56,7 @@ internal sealed class DialogService : IDialogService
 
         await DialogHost.Show(
             dialog,
+            "MainDialogHost",
             (object _, DialogClosingEventArgs _) => _isDialogVisible = false).ConfigureAwait(false);
     }