Warning: Undefined variable $factory in D:\Application\www\E-Tracking\database\factories\ModelFactory.php on line 15

Fatal error: Uncaught Error: Call to a member function define() on null in D:\Application\www\E-Tracking\database\factories\ModelFactory.php:15 Stack trace: #0 {main} thrown in D:\Application\www\E-Tracking\database\factories\ModelFactory.php on line 15