@san37Google has moved their files to different server.Go to file:oc-content/plugins/radius_search/js/markerclusterer.jsFind lines:Code: [Select] 'http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclusterer/' + 'images/m';Replace with:Code: [Select]'https://rawgit.com/googlemaps/js-marker-clusterer/gh-pages/images/m';
'http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclusterer/' + 'images/m';
'https://rawgit.com/googlemaps/js-marker-clusterer/gh-pages/images/m';