Warning: Undefined variable $factory in C:\xampp\htdocs\database\factories\UserFactory.php on line 21

Fatal error: Uncaught Error: Call to a member function define() on null in C:\xampp\htdocs\database\factories\UserFactory.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\database\factories\UserFactory.php on line 21