Fatal error: Uncaught Error: Interface "FunctionalPHP\FantasyLand\Functor" not found in C:\laragon\www\ado365n\vendor\widmogrod\php-functional\example\FreeMonadTest.php:19 Stack trace: #0 {main} thrown in C:\laragon\www\ado365n\vendor\widmogrod\php-functional\example\FreeMonadTest.php on line 19