Neos\Flow\Mvc\Controller\Arguments::offsetGet PHP Method

    public function offsetGet($offset)
    {
        $translatedOffset = $this->validateArgumentExistence($offset);
        if ($translatedOffset === false) {
            throw new \Neos\Flow\Mvc\Exception\NoSuchArgumentException('An argument "' . $offset . '" does not exist.', 1216909923);
        }
        return parent::offsetGet($translatedOffset);
    }