Fatal error: Uncaught Error: Class "Drupal\Core\Theme\Icon\IconExtractorBase" not found in /home/qcsvlel/www/core/lib/Drupal/Core/Theme/Icon/IconExtractorWithFinder.php:22 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/lib/Drupal/Core/Theme/Icon/IconExtractorWithFinder.php on line 22