Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Extension\Extension" not found in /home/astechc1/public_html/vendor/mercuryseries/flashy-bundle/src/DependencyInjection/MercurySeriesFlashyExtension.php:11 Stack trace: #0 {main} thrown in /home/astechc1/public_html/vendor/mercuryseries/flashy-bundle/src/DependencyInjection/MercurySeriesFlashyExtension.php on line 11