Не могу добавить значение в кеш?

$success = Yii::$app->cache->set($cacheKey, $data, DAY, $this->dependency);

$cacheKey = "Images::/2ws/dsasdsadas/",
$data = {simplehtmldom_1_5\simple_html_dom_node}[23]
DAY = 86400
$this->dependency = {yii\caching\DbDependency}[6]