502 Bad Gateway

nginx

Fatal error: Uncaught Error: Class 'Composer\Autoload\ClassLoader' not found in /www/wwwroot/www.5377cq.com/vendor/composer/autoload_real.php:28 Stack trace: #0 /www/wwwroot/www.5377cq.com/vendor/autoload.php(7): ComposerAutoloaderInit1e8b3d732b58358da5a1548c5ce3cc23::getLoader() #1 /www/wwwroot/www.5377cq.com/source/system/db.class.php(9): require_once('/www/wwwroot/ww...') #2 /www/wwwroot/www.5377cq.com/index.php(9): include_once('/www/wwwroot/ww...') #3 {main} thrown in /www/wwwroot/www.5377cq.com/vendor/composer/autoload_real.php on line 28