The child node "db_driver" at path "sonata_media" must be configured symfony

Question

I'm getting this error as I install the Sonata Media Bundle 2.3.0 in Symfony.

The child node "db_driver" at path "sonata_media" must be configured.

and while using the further command,

php app/console sonata:easy-extends:generate --dest=src SonataMediaBundle

in CMD I'm getting error,

[Symfony\Component\Config\Definition\Exception\InvalidConfigurationException] The child node "db_driver" at path "sonata_media" must be configured.

This is the image of my CMD where I'm getting the error

Here is image of my localhost where I'm getting problem

Please Help...!!!