Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\DependencyInjection\Extension' not found in /home/almasai/www/people/_old_site/vendor/AppVentus/BlogBundle/DependencyInjection/AvBlogExtension.php:15 Stack trace: #0 {main} thrown in /home/almasai/www/people/_old_site/vendor/AppVentus/BlogBundle/DependencyInjection/AvBlogExtension.php on line 15