Import notification file and updated other file..

app/Notifications/Common/ImportFailed.php

@@ -38,7 +38,7 @@ class ImportFailed extends Notification implements ShouldQueue
      */
     public function via($notifiable)
     {
-        return ['mail'];
+        return ['mail', 'database'];
     }
 
     /**
@@ -50,8 +50,8 @@ class ImportFailed extends Notification implements ShouldQueue
     public function toMail($notifiable)
     {
         $message = (new MailMessage)
-                        ->subject(trans('notifications.import.failed.subject'))
-                        ->line(trans('notifications.import.failed.description'));
+            ->subject(trans('notifications.import.failed.subject'))
+            ->line(trans('notifications.import.failed.description'));
 
         foreach ($this->errors as $error) {
             $message->line($error);
@@ -59,4 +59,17 @@ class ImportFailed extends Notification implements ShouldQueue
 
         return $message;
     }
+
+    /**
+     * Get the array representation of the notification.
+     *
+     * @param  mixed  $notifiable
+     * @return array
+     */
+    public function toArray($notifiable)
+    {
+        return [
+            'errors' => $this->errors,
+        ];
+    }
 }