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