Warning: require_once(lib/pkp/lib/vendor/autoload.php): Failed to open stream: No such file or directory in /var/www/html/lib/pkp/includes/bootstrap.php on line 28

Fatal error: Uncaught Error: Failed opening required 'lib/pkp/lib/vendor/autoload.php' (include_path='.:/usr/local/lib/php') in /var/www/html/lib/pkp/includes/bootstrap.php:28 Stack trace: #0 /var/www/html/index.php(18): require_once() #1 {main} thrown in /var/www/html/lib/pkp/includes/bootstrap.php on line 28