Fatal error: Uncaught Error: Class 'Illuminate\Database\Seeder' not found in /home/edmedu/www/edmclass.com.bak/edmclass-front/database/seeders/BoardSeeder.php:17 Stack trace: #0 {main} thrown in /home/edmedu/www/edmclass.com.bak/edmclass-front/database/seeders/BoardSeeder.php on line 17