Fatal error: Uncaught Error: Class "Illuminate\Database\Seeder" not found in C:\xampp\htdocs\fintraBackend\fi_adm\database\seeders\CampaignSeeder.php:12 Stack trace: #0 {main} thrown in C:\xampp\htdocs\fintraBackend\fi_adm\database\seeders\CampaignSeeder.php on line 12