Fatal error: Uncaught Error: Class 'Symfony\Component\HttpFoundation\RedirectResponse' not found in /home/optinadmin/rfl.optin.co.nz/concrete/src/Routing/RedirectResponse.php:6 Stack trace: #0 {main} thrown in /home/optinadmin/rfl.optin.co.nz/concrete/src/Routing/RedirectResponse.php on line 6