Fatal error: Uncaught Error: Interface "Composer\Plugin\Capability\CommandProvider" not found in C:\Apache24\htdocs\cms_upgrade\vendor\drupal\core-composer-scaffold\CommandProvider.php:12 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\drupal\core-composer-scaffold\CommandProvider.php on line 12