Fatal error: Uncaught Error: Class 'Contao\Theme' not found in /home/eberhardschwarze/public_html/vendor/contao-bootstrap/grid/src/Listener/ThemeExportListener.php:27 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/contao-bootstrap/grid/src/Listener/ThemeExportListener.php on line 27