Warning: require_once(/vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/frontend/web/install/src/controllers/DictionaryController.php on line 4

Fatal error: require_once(): Failed opening required '/vendor/autoload.php' (include_path='.:/usr/share/php') in /var/www/html/frontend/web/install/src/controllers/DictionaryController.php on line 4