Google Maps plugin issue - not sure what I'm doing wrong

Hello All,

I've installed and made active network wide your Google Maps plugin. I'm not sure what i'm doing wrong, but after applying the Google API in the plug in settings, get this dialogue on the page:

http://focalpointministries.net/events/2017/02/2017-iron-sharpens-iron-mens-conference-orlando-park-il/

Can you lend a hand please. This site is now live and the problem started happing last night.

Thank you in advance,

Adrian