Fatal error: Uncaught Error: Class 'PHPUnit\Framework\Constraint\Constraint' not found in E:\xampp\htdocs\www\qr251\vendor\symfony\mailer\Test\Constraint\EmailCount.php:17 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\qr251\vendor\symfony\mailer\Test\Constraint\EmailCount.php on line 17