Failed to apply plugin [id 'com.google.gms.google-services'] For input string: "+" in ionic?

      Hi, I am to explain about a most occurring error while putting google maps and push-notification plugin in a project. So finally found out the solution how to resolve this error.

                      Failed to apply plugin [id 'com.google.gms.google-services'] 

                      For input striing: "+"

  

Solution:

       Mostly this error occurs due to while adding google-maps and push-notification plugin in a project.I don't think the problem is coming from this plugin. It's probably another plugin that is using the + to include dependencies.

Go To:
       Script '/Users/giladkaplan1/Projects/Production/EPAActive/platforms/android/phonegap- plugin-push/XXXXXX-push.gradle' .
                   
           buildscript {
                   repositories {
                   jcenter()
                    mavenLocal()
                 }
              dependencies {
              classpath 'com.android.tools.build:gradle:+'
              classpath 'com.google.gms:google-services:3.0.0'
                }
               }
            // apply plugin: 'com.google.gms.google-services'
           // class must be used instead of id(string) to be able to apply plugin from non-root gradle file
           ext.postBuildExtras = {
           apply plugin: com.google.gms.googleservices.GoogleServicesPlugin
           }

         In this place classpath 'com.android.tools.build:gradle:+' here all ready having '+' in gradle. Then now got to platform/android/project.properties. Here also you found '+' in play-service-maps and play-service-location. 

   # This file is automatically generated by Android Tools.
          # Do not modify this file -- YOUR CHANGES WILL BE ERASED!
          #
          # This file must be checked in Version Control Systems.
          #
          # To customize properties used by the Ant build system edit
          # "ant.properties", and override values to adapt the script to your
          # project structure.
          #
          # To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
          #proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
          # Project target.
          target=android-25
          cordova.system.library.1=com.android.support:support-v4:24.1.1+
          cordova.system.library.2=com.google.android.gms:play-services-maps:+
          cordova.system.library.3=com.google.android.gms:play-services-location:+
          cordova.system.library.4=com.android.support:support-v13:25.1.0
          cordova.system.library.5=me.leolin:ShortcutBadger:1.1.17@aar
          cordova.system.library.6=com.google.firebase:firebase-messaging:11.0.1
          cordova.gradle.include.1=phonegap-plugin-push/education-push.gradle
          android.library.reference.1=CordovaLib

         Here play-service-maps and play-service-location also having '+'. I already told there is no problem in plugin. So  push-notifcation.gradle and project.properties having the '+' symbol so the reason they are confided. Now we want to add 11.0.1 instead of '+' in project.properties. Here 11.0.1 mentioned as a firebase version. So need to put version number instead of '+' in play-service-maps and play-service-location. You want to replace like this. 

   # This file is automatically generated by Android Tools.
          # Do not modify this file -- YOUR CHANGES WILL BE ERASED!
          #
          # This file must be checked in Version Control Systems.
          #
          # To customize properties used by the Ant build system edit
          # "ant.properties", and override values to adapt the script to your
          # project structure.
          #
          # To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
          #proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
          # Project target.
          target=android-25
          cordova.system.library.1=com.android.support:support-v4:24.1.1+
          cordova.system.library.2=com.google.android.gms:play-services-maps:11.0.1
          cordova.system.library.3=com.google.android.gms:play-services-location:11.0.1
          cordova.system.library.4=com.android.support:support-v13:25.1.0
          cordova.system.library.5=me.leolin:ShortcutBadger:1.1.17@aar
          cordova.system.library.6=com.google.firebase:firebase-messaging:11.0.1
          cordova.gradle.include.1=phonegap-plugin-push/education-push.gradle
          android.library.reference.1=CordovaLib 

By doing this my problem solved....