Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\DependencyInjection\Extension' not found in /home/eberhardschwarze/public_html/vendor/contao/installation-bundle/src/DependencyInjection/ContaoInstallationExtension.php:24 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/contao/installation-bundle/src/DependencyInjection/ContaoInstallationExtension.php on line 24