Warning: Undefined variable $factory in C:\mywamp\sites\allsite\calcomposer\database\factories\ModelFactory.php on line 15

Fatal error: Uncaught Error: Call to a member function define() on null in C:\mywamp\sites\allsite\calcomposer\database\factories\ModelFactory.php:15 Stack trace: #0 {main} thrown in C:\mywamp\sites\allsite\calcomposer\database\factories\ModelFactory.php on line 15