Fatal error: Uncaught Error: Class 'PHPUnit\Framework\Constraint\Constraint' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\console\Tester\Constraint\CommandIsSuccessful.php:17 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\console\Tester\Constraint\CommandIsSuccessful.php on line 17