Fatal error: Uncaught Error: Interface "Composer\Plugin\PluginInterface" not found in C:\Apache24\htdocs\cms_upgrade\vendor\drupal\core-project-message\MessagePlugin.php:17
Stack trace:
#0 {main}
thrown in C:\Apache24\htdocs\cms_upgrade\vendor\drupal\core-project-message\MessagePlugin.php on line 17