Fatal error: Uncaught Error: Interface 'Composer\Plugin\PluginInterface' not found in E:\xampp\htdocs\www\TT\ThinkPHP\vendor\topthink\think-installer\src\Plugin.php:10 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\TT\ThinkPHP\vendor\topthink\think-installer\src\Plugin.php on line 10