Warning: require_once(/volume1/web/PrestaShop/config/../vendor/autoload.php): Failed to open stream: No such file or directory in /volume1/web/PrestaShop/config/autoload.php on line 10

Fatal error: Uncaught Error: Failed opening required '/volume1/web/PrestaShop/config/../vendor/autoload.php' (include_path='.:/usr/share/pear') in /volume1/web/PrestaShop/config/autoload.php:10
Stack trace:
#0 /volume1/web/PrestaShop/config/config.inc.php(17): require_once()
#1 /volume1/web/PrestaShop/index.php(20): require_once('/volume1/web/Pr...')
#2 {main}
  thrown in /volume1/web/PrestaShop/config/autoload.php on line 10