Google Maps is not loaded correctly

Hi I'm developing a new site with Joomla 3.6.2, PHP 5.6, I had installed as usual ZHGooglemap component ver. 8.1.0.1, so I've introduce the latitude and longitude I've set up option as Google Maps JavaScript API Google Maps API version as 3 but in the backend and frontend I've "Google Maps is not loaded correctly. For technical details, see the JavaScript console"
Opened the JS consol and it report as follow:
"Google Maps API error: RefererNotAllowedMapError developers.google.com/maps/documentation...ot-allowed-map-error
Your site URL to be authorized: webmakeragency.it/"js:34:391
"Google Maps API warning: InvalidVersion developers.google.com/maps/documentation...ages#invalid-version "

I've missed myself

I found myself
the right key is not Maps JavaScript API but Browser key.
Right?
Now I'm displaying right the map

For new sites you have to enter Google Maps API Key.

Yes Dima, I've seen on the documentation, now with the API Key the map is visible on front end but not in theback end.
Do you know why?

Do you have any errors in browser's console?

"Google Maps API error: RefererNotAllowedMapError developers.google.com/maps/documentation...ot-allowed-map-error
Your site URL to be authorized: webmakeragency.it/administrator/index.ph...=edit&id=1"js:34:391
"Google Maps API warning: InvalidVersion developers.google.com/maps/documentation...ages#invalid-version "