Fatal error: Uncaught Error: Class 'Hamcrest\AbstractMatcherTest' not found in D:\xampp\htdocs\psp\backend\vendor\hamcrest\hamcrest-php\tests\Hamcrest\Core\IsInstanceOfTest.php:4 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\hamcrest\hamcrest-php\tests\Hamcrest\Core\IsInstanceOfTest.php on line 4