Fatal error: Uncaught Error: Class 'Symfony\Component\HttpFoundation\HeaderBag' not found in /home1/heyerarc/public_html/updates/concrete5-8.5.5_remote_updater/concrete/vendor/symfony/http-foundation/ResponseHeaderBag.php:19 Stack trace: #0 {main} thrown in /home1/heyerarc/public_html/updates/concrete5-8.5.5_remote_updater/concrete/vendor/symfony/http-foundation/ResponseHeaderBag.php on line 19