egeloen IvoryGoogleMapBundle ApI Key Error

[Sreekanthrdy]

iam using egeloen IvoryGoogleMapBundle and i have run all commands like

$ composer require egeloen/google-map-bundle

$ composer require egeloen/serializer-bundle
$ composer require php-http/guzzle6-adapter
$ composer require php-http/httplug-bundle

ihave include below three lines code in appkernal.

new Ivory\GoogleMapBundle\IvoryGoogleMapBundle(),

// Optionally
new Ivory\SerializerBundle\IvorySerializerBundle(),
new Http\HttplugBundle\HttplugBundle(),

and ihave generated api key aswell

But unfortunately the places API is not working and giving following error
in the console
" Google Maps JavaScript API warning: NoApiKeys
https://developers.google.com/maps/documentation/javascript/error-messages#no-api-keys"

Anyone can please let me know what I'm missing here.