Fatal error: Uncaught Error: Class 'Contao\CoreBundle\Picker\AbstractPickerProvider' not found in /home/eberhardschwarze/public_html/vendor/contao/core-bundle/src/Picker/ArticlePickerProvider.php:18 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/contao/core-bundle/src/Picker/ArticlePickerProvider.php on line 18