Fatal error: Uncaught Error: Interface "Composer\Plugin\PluginInterface" not found in C:\Apache24\htdocs\cms_upgrade\vendor\composer\installers\src\Composer\Installers\Plugin.php:9 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\composer\installers\src\Composer\Installers\Plugin.php on line 9