diff --git a/ecommerce_app/lib/src/features/authentication/data/fake_auth_repository.dart b/ecommerce_app/lib/src/features/authentication/data/fake_auth_repository.dart
index cdf23a1e..63543e16 100644
--- a/ecommerce_app/lib/src/features/authentication/data/fake_auth_repository.dart
+++ b/ecommerce_app/lib/src/features/authentication/data/fake_auth_repository.dart
@@ -4,7 +4,6 @@ import 'package:ecommerce_app/src/features/authentication/domain/fake_app_user.d
 import 'package:ecommerce_app/src/utils/delay.dart';
 import 'package:ecommerce_app/src/utils/in_memory_store.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:multiple_result/multiple_result.dart';
 
 class FakeAuthRepository {
   FakeAuthRepository({this.addDelay = true});
@@ -17,40 +16,38 @@ class FakeAuthRepository {
   // List to keep track of all user accounts
   final List<FakeAppUser> _users = [];
 
-  Future<Result<void, AppException>> signInWithEmailAndPassword(
-      String email, String password) async {
+  Future<void> signInWithEmailAndPassword(String email, String password) async {
     await delay(addDelay);
     // check the given credentials agains each registered user
     for (final u in _users) {
       // matching email and password
       if (u.email == email && u.password == password) {
         _authState.value = u;
-        return const Success(null);
+        return;
       }
       // same email, wrong password
       if (u.email == email && u.password != password) {
-        return Error(WrongPasswordException());
+        throw WrongPasswordException();
       }
     }
-    return Error(UserNotFoundException());
+    throw UserNotFoundException();
   }
 
-  Future<Result<void, AppException>> createUserWithEmailAndPassword(
+  Future<void> createUserWithEmailAndPassword(
       String email, String password) async {
     await delay(addDelay);
     // check if the email is already in use
     for (final u in _users) {
       if (u.email == email) {
-        return Error(EmailAlreadyInUseException());
+        throw EmailAlreadyInUseException();
       }
     }
     // minimum password length requirement
     if (password.length < 8) {
-      return Error(WeakPasswordException());
+      throw WeakPasswordException();
     }
     // create new user
     _createNewUser(email, password);
-    return const Success(null);
   }
 
   Future<void> signOut() async {
diff --git a/ecommerce_app/lib/src/features/authentication/presentation/sign_in/email_password_sign_in_controller.dart b/ecommerce_app/lib/src/features/authentication/presentation/sign_in/email_password_sign_in_controller.dart
index 1ef2f9da..d04ef7c5 100644
--- a/ecommerce_app/lib/src/features/authentication/presentation/sign_in/email_password_sign_in_controller.dart
+++ b/ecommerce_app/lib/src/features/authentication/presentation/sign_in/email_password_sign_in_controller.dart
@@ -1,8 +1,6 @@
-import 'package:ecommerce_app/src/exceptions/app_exception.dart';
 import 'package:ecommerce_app/src/features/authentication/data/fake_auth_repository.dart';
 import 'package:ecommerce_app/src/features/authentication/presentation/sign_in/email_password_sign_in_state.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:multiple_result/multiple_result.dart';
 
 class EmailPasswordSignInController
     extends StateNotifier<EmailPasswordSignInState> {
@@ -14,17 +12,12 @@ class EmailPasswordSignInController
 
   Future<bool> submit(String email, String password) async {
     state = state.copyWith(value: const AsyncValue.loading());
-    final result = await _authenticate(email, password);
-    final value = result.when(
-      (success) => AsyncData(success),
-      (error) => AsyncError(error, StackTrace.current),
-    ) as AsyncValue;
+    final value = await AsyncValue.guard(() => _authenticate(email, password));
     state = state.copyWith(value: value);
     return value.hasError == false;
   }
 
-  Future<Result<void, AppException>> _authenticate(
-      String email, String password) {
+  Future<void> _authenticate(String email, String password) {
     switch (state.formType) {
       case EmailPasswordSignInFormType.signIn:
         return authRepository.signInWithEmailAndPassword(email, password);
diff --git a/ecommerce_app/pubspec.lock b/ecommerce_app/pubspec.lock
index 52466717..0ce65147 100644
--- a/ecommerce_app/pubspec.lock
+++ b/ecommerce_app/pubspec.lock
@@ -279,14 +279,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.1"
-  multiple_result:
-    dependency: "direct main"
-    description:
-      name: multiple_result
-      sha256: "9aba99bd75f28ac6519980580636348c0327e225d950a239fa59d2d983af4ce4"
-      url: "https://pub.dev"
-    source: hosted
-    version: "5.0.0"
   path:
     dependency: transitive
     description:
diff --git a/ecommerce_app/pubspec.yaml b/ecommerce_app/pubspec.yaml
index f6957643..8f00de40 100644
--- a/ecommerce_app/pubspec.yaml
+++ b/ecommerce_app/pubspec.yaml
@@ -22,7 +22,6 @@ dependencies:
   sembast: 3.5.0+1
   sembast_web: 2.2.0
   path_provider: 2.1.1
-  multiple_result: 5.0.0
 
 dev_dependencies:
   flutter_test: