main.js file of google map is not found

I installed the latest build from the github. I am using google map for displaying the map on /map page i.e. www.mysite.com/msp
Currently map is not being displayed. I tried to debug using inspect element and it showed me following output.

Uncaught TypeError: undefined is not a function markers_googlemaps.js?n4hiv5:53

Failed to load resource: net::ERR_CONNECTION_REFUSED https://maps.gstatic.com/intl/en_us/mapfiles/api-3/14/16/main.js

event.returnValue is deprecated. Please use the standard event.preventDefault() instead.

Uncaught TypeError: undefined is not a function markers_googlemaps.js?n4hiv5:13

It looks like https://maps.gstatic.com/intl/en_us/mapfiles/api-3/14/16/main.js file is not found.
I tried in chrome incognito too, because some extensions might be blocking it. but no clue.