diff --git a/dotnet/AipsCore/Domain/Models/User/Validation/UserErrors.cs b/dotnet/AipsCore/Domain/Models/User/Validation/UserErrors.cs
index 558d7a6..8f8b122 100644
--- a/dotnet/AipsCore/Domain/Models/User/Validation/UserErrors.cs
+++ b/dotnet/AipsCore/Domain/Models/User/Validation/UserErrors.cs
@@ -1,9 +1,24 @@
 using AipsCore.Domain.Abstract.Validation;
+using AipsCore.Domain.Common.Validation;
 using AipsCore.Domain.Models.User.ValueObjects;
 
 namespace AipsCore.Domain.Models.User.Validation;
 
 public class UserErrors : AbstractErrors<User, UserId>
 {
+    public static ValidationError LoginErrorUserNotFoundByEmail(string email)
+    {
+        string code = "login_error_user_not_found_by_email";
+        string message = $"User with email '{email}' not found";
+
+        return CreateValidationError(code, message);
+    }
     
+    public static ValidationError LoginErrorIncorrectPassword()
+    {
+        string code = "login_error_incorrect_password";
+        string message = $"Incorrect password provided";
+
+        return CreateValidationError(code, message);
+    }
 }
\ No newline at end of file