Warning: require_once(vendor/autoload.php): failed to open stream: No such file or directory in /home/synap/fr/synap/dev/www/7/vendor/doctrine/dbal/docs/examples/sharding/bootstrap.php on line 6

Fatal error: require_once(): Failed opening required 'vendor/autoload.php' (include_path='.:/usr/local/php7.3/lib/php') in /home/synap/fr/synap/dev/www/7/vendor/doctrine/dbal/docs/examples/sharding/bootstrap.php on line 6