Fatal error: Uncaught Error: Class 'Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand' not found in /home/eberhardschwarze/public_html/vendor/contao/installation-bundle/src/Command/LockCommand.php:23 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/contao/installation-bundle/src/Command/LockCommand.php on line 23