Warning: require_once(vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/forms_dir/vendor/codeception/stub/RoboFile.php on line 2

Fatal error: require_once(): Failed opening required 'vendor/autoload.php' (include_path='.:/usr/share/php') in /var/www/html/forms_dir/vendor/codeception/stub/RoboFile.php on line 2