Fatal error: Uncaught Error: Class 'Contao\CoreBundle\Fragment\Reference\FragmentReference' not found in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Fragment/Reference/FrontendModuleReference.php:18 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Fragment/Reference/FrontendModuleReference.php on line 18