Fatal error: Uncaught Error: Class "PHPUnit\Framework\Constraint\Constraint" not found in /home/custom/public_html/katiekarr/vendor/symfony/mime/Test/Constraint/EmailHasHeader.php:17
Stack trace:
#0 {main}
thrown in /home/custom/public_html/katiekarr/vendor/symfony/mime/Test/Constraint/EmailHasHeader.php on line 17