Missing api_key/current key with Google Services 3.0.0

Since I upgraded the project with the latest version of google services and libraries (9.0.0), I have this strange issue :

Grade console :

:app:processDebugGoogleServices
Parsing json file: /Users/cyrilmorales/Documents/Projects/mobilemeans-punainenristi/app/google-services.json
:app:processDebugGoogleServices FAILED
Error:Execution failed for task ':app:processDebugGoogleServices'.
> Missing api_key/current_key object
Information:BUILD FAILED

build.gradle (root) :

dependencies {
    classpath 'com.android.tools.build:gradle:2.2.0-alpha1'
    classpath 'com.google.gms:google-services:3.0.0'
}

build.gradle (app) :

dependencies {
    ....
    compile 'com.google.android.gms:play-services-analytics:9.0.0'
    compile 'com.google.android.gms:play-services-gcm:9.0.0'
    compile 'com.google.android.gms:play-services-maps:9.0.0'
    compile 'com.google.android.gms:play-services-location:9.0.0'
    ...
}
apply plugin: 'com.google.gms.google-services'

However, it works well with the play service libraries in 8.4.0 and google-services 2.1.0

Do you have any idea of the solution ?

Generate new config file (google-services.json) from: https://developers.google.com/cloud-messaging/android/client#get-config

Newly config file with "api_key": [ { "current_key": XXX } ] in client section

Update: or manually enabled service in developer console and generate key.

Adding empty current key value in google-services.json file solved this problem for me

"api_key": [{ "current_key": "" }]