Fatal error: Uncaught Error: Interface "Composer\Plugin\PluginInterface" not found in /home/cooperativamaism/public_html/staging/vendor/craftcms/plugin-installer/src/Plugin.php:18 Stack trace: #0 {main} thrown in /home/cooperativamaism/public_html/staging/vendor/craftcms/plugin-installer/src/Plugin.php on line 18