Fatal error: Uncaught Error: Interface 'Composer\Plugin\PluginInterface' not found in /home/www/scNAorgWebSite/wp-content/plugins/mailoptin/vendor/barryvdh/composer-cleanup-plugin/src/CleanupPlugin.php:15 Stack trace: #0 {main} thrown in /home/www/scNAorgWebSite/wp-content/plugins/mailoptin/vendor/barryvdh/composer-cleanup-plugin/src/CleanupPlugin.php on line 15