How to embed reports having google maps provided by jasper soft using visualize js.

Hi,

I am trying to embed reports having jasper google maps through visualize js. But i am getting error :

Google Maps API error: MissingKeyMapError https://developers.google.com/maps/documentation/javascript/error-messag...

I am using  Jaspersoft enterprise edition. Can anyone tell me how to get the necessary API key or the correct procedure for embedding google maps provided by jasper soft through visualize js.