Fatal error: Uncaught Error: Class "Illuminate\Database\Seeder" not found in /var/www/html/mylaravel/vendor/laravel/horizon/workbench/database/seeders/DatabaseSeeder.php:8 Stack trace: #0 {main} thrown in /var/www/html/mylaravel/vendor/laravel/horizon/workbench/database/seeders/DatabaseSeeder.php on line 8