Fatal error: Uncaught Error: Interface "Drupal\Composer\Plugin\Scaffold\PostPackageEventListenerInterface" not found in C:\Apache24\htdocs\cms_upgrade\vendor\drupal\core-composer-scaffold\AllowedPackages.php:19 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\drupal\core-composer-scaffold\AllowedPackages.php on line 19