Fatal error: Uncaught Error: Class 'PHPUnit\Framework\Constraint\Constraint' not found in C:\xampp\htdocs\plugins\Symfony\Component\Mailer\Test\Constraint\EmailIsQueued.php:17
Stack trace:
#0 {main}
thrown in C:\xampp\htdocs\plugins\Symfony\Component\Mailer\Test\Constraint\EmailIsQueued.php on line 17