<div class=”gm-err-title”>Oops! Something went wrong.</div> <div class=”gm-err-message”>This page didn’t load Google Maps correctly. See the JavaScript console for technical details.</div>
Looks like it could be due to Google Maps API key issue.
Please see this topic – https://stackoverflow.com/questions/35288250/google-maps-javascript-api-referernotallowedmaperror and let us know if by following it’s solutions you managed to fix this issue.