Fatal error: Uncaught Error: Class 'Illuminate\Database\Seeder' not found in C:\dolibarr\www\LevEnt1\vendor\backpack\crud\tests\config\database\seeds\UsersTableSeeder.php:9 Stack trace: #0 {main} thrown in C:\dolibarr\www\LevEnt1\vendor\backpack\crud\tests\config\database\seeds\UsersTableSeeder.php on line 9