Yii2 URL manager cache class
You might come across the below warning if you have not set a cache to your Yii2 application while using URL manager. Unable to use cache for URL manager: Failed to instantiate component or class "cache". In order to remove that warning, setup a cache in your application’s configuration. We are using the DummyCache class here as we have yet to decide on one that we want to use. 'components' => [ 'cache' => [ 'class' => 'yii\caching\DummyCache', // FIXME ], ],