Devise\Pages\Interpreter\TagManager::assertInitialized PHP Method

    protected function assertInitialized()
    {
        if (is_null($this->pageVersionId) || is_null($this->pageId) || is_null($this->languageId)) {
            throw new PageDataNotInitializedException('You must initialize the dvsPageData singleton with a page id, page version id and language id.');
        }
    }