Fatal error: Uncaught Error: Interface "FunctionalPHP\FantasyLand\Functor" not found in C:\laragon\www\ado365n\vendor\widmogrod\php-functional\example\FreeCalculatorTest.php:26 Stack trace: #0 C:\laragon\www\ado365n\vendor\widmogrod\php-functional\example\ParserTest.php(33): require_once() #1 {main} thrown in C:\laragon\www\ado365n\vendor\widmogrod\php-functional\example\FreeCalculatorTest.php on line 26