Fatal error: Uncaught Error: Class 'Contao\InstallationBundle\Database\AbstractVersionUpdate' not found in /home/eberhardschwarze/public_html/vendor/contao/installation-bundle/src/Database/Version447Update.php:18 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/contao/installation-bundle/src/Database/Version447Update.php on line 18