Warning: require_once(/var/www/html/vendor/autoload.php): Failed to open stream: No such file or directory in /var/www/html/config/config.php on line 20

Fatal error: Uncaught Error: Failed opening required '/var/www/html/vendor/autoload.php' (include_path='.:/usr/local/lib/php') in /var/www/html/config/config.php:20 Stack trace: #0 /var/www/html/index.php(12): require_once() #1 {main} thrown in /var/www/html/config/config.php on line 20