Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\DependencyInjection\Extension' not found in /home/users/00/3c/21/home/www/vendor/kevinpapst/adminlte-bundle/DependencyInjection/AdminLTEExtension.php:23 Stack trace: #0 {main} thrown in /home/users/00/3c/21/home/www/vendor/kevinpapst/adminlte-bundle/DependencyInjection/AdminLTEExtension.php on line 23