Warning: require_once(vendor/autoload.php): Failed to open stream: No such file or directory in /var/www/www-root/data/www/core/app/mainController.php on line 6

Fatal error: Uncaught Error: Failed opening required 'vendor/autoload.php' (include_path='.:') in /var/www/www-root/data/www/core/app/mainController.php:6 Stack trace: #0 /var/www/www-root/data/www/core/index.php(13): require_once() #1 {main} thrown in /var/www/www-root/data/www/core/app/mainController.php on line 6