Fatal error: Uncaught Error: Class "Drupal\config_translation\FormElement\FormElementBase" not found in /home/qcsvlel/www/core/modules/config_translation/src/FormElement/PluralVariants.php:14 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/config_translation/src/FormElement/PluralVariants.php on line 14