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 3

Fatal error: Uncaught Error: Failed opening required '/var/www/html/vendor/autoload.php' (include_path='.:/usr/share/php') in /var/www/html/autoload.php:3 Stack trace: #0 /var/www/html/app/config/bootstrap.php(5): require() #1 /var/www/html/index.php(9): require('...') #2 {main} thrown in /var/www/html/autoload.php on line 3