Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DependencyInjection\Extension" not found in /home/microfrlnn/backBO/vendor/symfony/mercure-bundle/src/DependencyInjection/MercureExtension.php:53 Stack trace: #0 {main} thrown in /home/microfrlnn/backBO/vendor/symfony/mercure-bundle/src/DependencyInjection/MercureExtension.php on line 53