How to solve Firebase API initialization failure (Android + Firebase)

Question

I recently needed to use Google GCM in my project. From its website it is said:

Firebase Cloud Messaging (FCM) is the new version of GCM. It inherits

Answer 1

You can check the dependencies with gradle command

./gradlew app:dependencies

As Edgar said ensure that all the dependency libraries has same version. If not then you can exclude that dependency using

compile('your dependency') {
    exclude group: 'lib to be removed'
}

And add that dependency yourself.