Notice: Undefined variable: factory in C:\xampp\htdocs\app\database\factories\UserFactory.php on line 20

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