Warning: require(/var/www/html/vendor/autoload.php): Failed to open stream: No such file or directory in /var/www/html/autoload.php on line 15

Fatal error: Uncaught Error: Failed opening required '/var/www/html/vendor/autoload.php' (include_path='.:/usr/share/php') in /var/www/html/autoload.php:15 Stack trace: #0 /var/www/html/index.php(14): require_once() #1 {main} thrown in /var/www/html/autoload.php on line 15