Phonegap-plugin-push causes build error

Ionic Framework
1

HI,
i have installed the plugin

phonegap-plugin-push

Now my build fails with the following error and i can’t fix the problem.

> Configure project :app
WARNING: Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.

FAILURE: Build failed with an exception.

* Where:
Script 'D:\ionic\myapp\platforms\android\cordova-support-google-services\myapp-build.gradle' line: 16

It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html
* What went wrong:
A problem occurred evaluating project ':app'.
> Failed to apply plugin [class 'com.google.gms.googleservices.GoogleServicesPlugin']
   > For input string: "+"
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