Fatal error: Uncaught Error: Interface 'Composer\Plugin\PluginInterface' not found in /home/luxurytr/public_html/lt8/vendor/craftcms/plugin-installer/src/Plugin.php:18 Stack trace: #0 {main} thrown in /home/luxurytr/public_html/lt8/vendor/craftcms/plugin-installer/src/Plugin.php on line 18