Fatal error: Uncaught Error: Class "Illuminate\Database\Seeder" not found in C:\xampp\htdocs\WorkflowMgmt\database\seeders\DemoConfigurationSeeder.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\WorkflowMgmt\database\seeders\DemoConfigurationSeeder.php on line 20