Fatal error: Uncaught Error: Class 'PHPUnit\Framework\Constraint\Constraint' not found in E:\xampp\htdocs\resize_image\vendor\symfony\http-foundation\Test\Constraint\ResponseHasHeader.php:17 Stack trace: #0 {main} thrown in E:\xampp\htdocs\resize_image\vendor\symfony\http-foundation\Test\Constraint\ResponseHasHeader.php on line 17