API key problem is note being read.

Hello.
The plugins seems to be exactly what I’m looking for, but whenever I try to create a form, I get this error message:

Google Maps API error: MissingKeyMapError https://developers.google.com/maps/documentation/javascript/error-messages#missing-key-map-error

I’ve tried several different API keys. No luck.
Think you could help me out?

Thanks in advance.