Fatal error: Uncaught Error: Class 'Composer\Installer\LibraryInstaller' not found in /data0/wwwroot/online.chinesephoto.cn/vendor/topthink/think-installer/src/ThinkTesting.php:19
Stack trace:
#0 {main}
thrown in /data0/wwwroot/online.chinesephoto.cn/vendor/topthink/think-installer/src/ThinkTesting.php on line 19