Google Maps API Issue

I am using a plugin (Store Locator Plus) to generate a searchable Google map, and although I’ve experienced substantial performance improvements using your plugin, the settings I’m currently using seem to be preventing the Google Maps API from validating my API Key. Thanks in advance for your assistance!

Error Message for your reference:

[Error] Google Maps API error: MissingKeyMapError https://developers.google.com/maps/documentation/javascript/error-messages#missing-key-map-error
Ib (Anonymous Script 1 (line 2:10327))
(anonymous function) (common.js:54:97)
(anonymous function) (common.js:152:176)
c (common.js:48:86)
Global Code (AuthenticationService.Authenticate:1)

The page I need help with: [log in to see the link]