diff --git a/BFR/Operations/Operation.cs b/BFR/Operations/Operation.cs
index b536ed1..8b9426a 100644
--- a/BFR/Operations/Operation.cs
+++ b/BFR/Operations/Operation.cs
@@ -11,7 +11,7 @@ namespace BFR.Operations
     public abstract class Operation : AvaloniaObject
     {
         // Needs to be avalonia property to update UI with any potential error.
-        public AvaloniaProperty<string> errorProperty = AvaloniaProperty.Register<Operation, string>(nameof(Error), defaultValue: "");
+        private readonly AvaloniaProperty<string> errorProperty = AvaloniaProperty.Register<MainWindow, string>(nameof(Error), defaultValue: "");
         public string Error { get => GetValue(errorProperty); set => SetValue(errorProperty, value); }
         public bool IsEnabled { get; set; } = true;
         public abstract string Name { get; }