As of June 22, 2016 Google Maps no longer support keyless access (any request that doesn't include an API key). A limited number of map loads per day was implemented by Google.
We strongly recommend you to create your own API key to ensure you don't have any problems loading Google Maps on your site

  1. Click on this link https://goo.gl/Wi6DqG
  2. Click on the “Get Key” button

    Get Google Maps API Key

  3. Select or create a Project to which this Key will be assigned

    Enable Google Maps API

    Enter Project Name Google Maps API

  4. Accept the service’s Terms & Conditions
  5. All is set, now you can copy and paste your API Key where is needed