Hello,
I saw the screenshot and visited your website. The Error you mentioned is not related to the Theme, it is related to the google Maps API.
Please read the following article for help in fixing the issue:
https://developers.google.com/maps/documentation/javascript/error-messages#referer-not-allowed-map-error
Also make sure that you are adding the Google Maps API key Under Theme Settings >> API integrations.
Screenshot for Clarification: https://gyazo.com/afc062beb43b3df77dd44af7f35f6dc7
Also in the Google Maps element you are using in the page then check back.
Best Regards