Fatal error: Uncaught Error: Class "PHPUnit\Framework\Constraint\Constraint" not found in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\mime\Test\Constraint\EmailHasHeader.php:17 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\mime\Test\Constraint\EmailHasHeader.php on line 17