Don’t despair! I had the same message. What does the Java Script console say? (click red x top right – red message should appear at bottom). In my case it said ‘ApiNotActivatedMapError’. I had simply failed to activate the API key correctly – maybe the same for you, in which case go back to the Google page that the original error message directed you to and follow the instructions for activating the API key. I agree it seems unnecessarily complicated.