Fatal error: Uncaught Error: Interface 'Hamcrest\SelfDescribing' not found in D:\xampp\htdocs\psp\backend\vendor\hamcrest\hamcrest-php\tests\Hamcrest\StringDescriptionTest.php:6 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\hamcrest\hamcrest-php\tests\Hamcrest\StringDescriptionTest.php on line 6