Due to Google Maps API recent changes all new websites using Google Maps API have to use Google Maps API keys. 

You must get 2 separate keys from Google Developer Console. 

One will have HTTP referrers as key restriction, here you have to set your website address. 
You should add this key in API Browser key at Backend > Taxi Booking > Settings > Map settings. 

The other key has to be of Server type, here you have to set IP addresses as key restriction and use your server IP address. You have to add this key in API Server key at Backend > Taxi Booking > Settings > Map settings. 

Please wait at least 10 mins after doing any changes in Google Developer console.

In your Google Developer Console you have to also enable the following APIs:
Google Maps Coordinate API 
Google Maps Directions API 
Google Maps Distance Matrix API 
Google Maps Geocoding API 
Google Maps JavaScript API 

Please make sure that you enter correct Browser and Server API keys at Taxi Booking > Settings > Map Settings.
Alos please set "SSL Enabled?: Yes".

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