Warning: Undefined variable $factory in C:\xampp\htdocs\database\factories\PhoneNumberFactory.php on line 20

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