Fatal error: Uncaught Error: Call to undefined function app() in E:\xampp\htdocs\www\yunwei\qr2500\vendor\dcat\laravel-admin\tests\resources\seeds\factory.php:6 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\yunwei\qr2500\vendor\dcat\laravel-admin\tests\resources\seeds\factory.php on line 6