Fatal error: Uncaught Error: Class 'Composer\Installer\LibraryInstaller' not found in /www/wwwroot/0.vhai.com/1.vhai.com/feijin_shop/source/vendor/topthink/think-installer/src/ThinkTesting.php:19 Stack trace: #0 {main} thrown in /www/wwwroot/0.vhai.com/1.vhai.com/feijin_shop/source/vendor/topthink/think-installer/src/ThinkTesting.php on line 19