Warning: Undefined variable $factory in C:\xampp\htdocs\datatablecolcolor\Laravel-Datatables-Column-Colors\database\factories\UserFactory.php on line 19

Fatal error: Uncaught Error: Call to a member function define() on null in C:\xampp\htdocs\datatablecolcolor\Laravel-Datatables-Column-Colors\database\factories\UserFactory.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\datatablecolcolor\Laravel-Datatables-Column-Colors\database\factories\UserFactory.php on line 19