Fatal error: Uncaught Error: Interface "Symfony\Component\Mercure\Exception\ExceptionInterface" not found in /home/believers/public_html/concrete/vendor/symfony/mercure/src/Exception/InvalidArgumentException.php:21 Stack trace: #0 {main} thrown in /home/believers/public_html/concrete/vendor/symfony/mercure/src/Exception/InvalidArgumentException.php on line 21