Fatal error: Uncaught Error: Interface "Drupal\Core\Theme\Icon\IconDefinitionInterface" not found in /home/qcsvlel/www/core/lib/Drupal/Core/Theme/Icon/IconDefinition.php:17 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/lib/Drupal/Core/Theme/Icon/IconDefinition.php on line 17