diff --git a/api/components/ErrorHandler.php b/api/components/ErrorHandler.php
new file mode 100644
index 0000000..ee04676
--- /dev/null
+++ b/api/components/ErrorHandler.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace api\components;
+
+class ErrorHandler extends \common\components\ErrorHandler
+{
+    public $errorAction = 'site/error';
+}
diff --git a/api/config/main.php b/api/config/main.php
index 765f5eb..ffc64f5 100644
--- a/api/config/main.php
+++ b/api/config/main.php
@@ -39,15 +39,12 @@
             ],
         ],
         'errorHandler' => [
-            'class' => common\components\ErrorHandler::className(),
+            'class' => api\components\ErrorHandler::className(),
         ],
         'urlManager'   => [
             // to improve the security
             'enableStrictParsing' => true
         ],
-        'response' => [
-            'format' => yii\web\Response::FORMAT_JSON
-        ]
     ],
     'params'              => $params,
 ];
diff --git a/api/controllers/SiteController.php b/api/controllers/SiteController.php
new file mode 100644
index 0000000..b999ecb
--- /dev/null
+++ b/api/controllers/SiteController.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace api\controllers;
+
+use yii\rest\Controller;
+
+/**
+ * Site controller.
+ */
+class SiteController extends Controller
+{
+    public function behaviors()
+    {
+        $behaviors = parent::behaviors();
+
+        $behaviors['authenticator']['except'] = [
+            'error',
+        ];
+
+        return $behaviors;
+    }
+
+    public function actionError()
+    {
+        $exception = \Yii::$app->errorHandler->exception;
+
+        if ($exception !== null) {
+            return [
+                'name'   => $exception->getName(),
+                'status' => $exception->statusCode,
+            ];
+        }
+    }
+}
diff --git a/api/forms/LoginForm.php b/api/forms/LoginForm.php
index 480152e..96af501 100644
--- a/api/forms/LoginForm.php
+++ b/api/forms/LoginForm.php
@@ -54,4 +54,20 @@ public function login()
         }
         return false;
     }
-}
\ No newline at end of file
+
+    /**
+     * This class permits its instance to get the login column.
+     *
+     * @author Muhammad Yahya Muhaimin <myahyamuhaimin@yahoo.com>
+     */
+    public function getLoginColumn()
+    {
+        try {
+            $loginColumn = parent::getLoginColumn();
+        } catch (InvalidConfigException $e) {
+            return $e->getMessage();
+        }
+
+        return $loginColumn;
+    }
+}
diff --git a/api/modules/v1/controllers/AuthController.php b/api/modules/v1/controllers/AuthController.php
index f8346ef..faf3a7d 100644
--- a/api/modules/v1/controllers/AuthController.php
+++ b/api/modules/v1/controllers/AuthController.php
@@ -98,14 +98,6 @@ public function actionLogin()
             throw new HttpException(400, $e->getMessage(), ApiCode::DEVICE_IDENTIFIER_NOT_FOUND);
         }
 
-        $loginByEmail = \Yii::$app->params['loginByEmail'];
-
-        if ($loginByEmail) {
-            $loginForm->setScenario(LoginForm::SCENARIO_SUBMIT_LOGIN_EMAIL);
-        } else {
-            $loginForm->setScenario(LoginForm::SCENARIO_SUBMIT_LOGIN_USERNAME);
-        }
-
         $loginForm->load(\Yii::$app->request->post(), 'User');
 
         /*
@@ -117,7 +109,20 @@ public function actionLogin()
              */
             $user = \Yii::$app->user->getIdentity();
 
-            $msgLoginBy = $loginByEmail ? 'email ' . $user->email : 'username ' . $user->username;
+            $msgLoginBy = '';
+            $loginColumn = $loginForm->getLoginColumn();
+
+            switch ($loginColumn) {
+                case 'username':
+                    $msgLoginBy = 'username ' . $user->username;
+                    break;
+                case 'email':
+                    $msgLoginBy = 'email ' . $user->email;
+                    break;
+                default:
+                    $msgLoginBy = $loginColumn;
+                    break;
+            }
 
             return [
                 'name'    => 'Success',
@@ -226,7 +231,6 @@ public function actionResetPassword($resetPasswordToken)
 
         // this will catch POST request
         if (\Yii::$app->request->isPost) {
-
             $passwordForm->load(\Yii::$app->request->post(), 'User');
 
             if ($passwordForm->validate() && $passwordForm->resetPassword()) {