Recently Google Map changed their API key's, So please edit your google map and insert new API key.
You can get new API key here: https://developers.google.com/maps/documentation/javascript/get-api-key
Alternative Method
Another way for showing google map on your site is google map iframe, Go to this page: https://www.google.com/maps/
Then search your address and click on share button, Then copy embed code and in your page via page builder add Raw HTML element and paste embed code. Please see attachment.
