Fatal error: Uncaught Error: Interface 'Hamcrest\SelfDescribing' not found in E:\xampp\htdocs\vendor\hamcrest\hamcrest-php\tests\Hamcrest\StringDescriptionTest.php:4 Stack trace: #0 {main} thrown in E:\xampp\htdocs\vendor\hamcrest\hamcrest-php\tests\Hamcrest\StringDescriptionTest.php on line 4