Fatal error: Uncaught Error: Interface 'Composer\Plugin\Capability\CommandProvider' not found in /home/devmecseminars/public_html/mec/vendor/drupal/core-composer-scaffold/CommandProvider.php:12 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/drupal/core-composer-scaffold/CommandProvider.php on line 12