Warning: Undefined variable $factory in D:\programs\xampp\htdocs\laravel-blog-api\database\factories\UserFactory.php on line 20

Fatal error: Uncaught Error: Call to a member function define() on null in D:\programs\xampp\htdocs\laravel-blog-api\database\factories\UserFactory.php:20 Stack trace: #0 {main} thrown in D:\programs\xampp\htdocs\laravel-blog-api\database\factories\UserFactory.php on line 20