Fatal error: Uncaught Error: Interface "Drupal\Core\Theme\StarterKitInterface" not found in /home/qcsvlel/www/core/themes/starterkit_theme/src/StarterKit.php:10 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/themes/starterkit_theme/src/StarterKit.php on line 10