I'm trying to create a simple html page (I'd later like to add an autocomplete input there) that include google-places-api. I have an api-key (which is enabled) but I still get an error message.
Here is my html-
test but I get this error message- 
and in the console I get - Google Maps API error: Google Maps API error: ApiNotActivatedMapError
I can't understand what the problem is.. Appreciate anybody's help
To enable Api do this
API ManagerOverviewGoogle Maps JavaScript API(Under Google Maps APIs). Click on thatEnable button there. Click to enable API.Hope this will solve the problem of enabling API.
as of Jan 2017, unfortunately @Adi's answer, while it seems like it should work, does not. (Google's API key process is buggy)
you'll need to click "get a key" from this link: https://developers.google.com/maps/documentation/javascript/get-api-key
also I strongly recommend you don't ever choose "secure key" until you are ready to switch to production. I did http referrer restrictions on a key and afterwards was unable to get it working with localhost, even after disabling security for the key. I had to create a new key for it to work again.
Have you tried following the advice on the linked help page? The help page at http://g.co/mapsJSApiErrors says:
ApiNotActivatedMapError
The Google Maps JavaScript API is not activated on your API project. You may need to enable the Google Maps JavaScript API under APIs in the Google Developers Console.
See Obtaining an API key.
So check that the key you are using has Google Maps JavaScript API enabled.
I had the same error. To fix the error:
Gallery Menu and select API Manager.Credentials and then click New Credentials.Create Credentials.API KEY.Navigator Key (there are more options; It depends on when consumed).You must use this new API Navigator Key, generated by the system.