Cannot add task 'processDebugGoogleServices' as a task with that name already exists - ionic4

Question

What went wrong?
org.gradle.api.internal.tasks.DefaultTaskContainer$DuplicateTaskException:
Cannot add task 'processDebugGoogleServices' as a task with that name
already exists.
I want to test firebase FCM plugin, but it seems to have a lot of errors,
after solved many of them, here what I'm trying to do: ionic cordova build
android, I have this error:
ionic info:
platforms\android\cordova-plugin-fcm-with-dependecy-updated:
buildscript {
repositories {
mavenCentral()
jcenter()
mavenLocal()
google()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.3.+'
classpath 'com.google.gms:google-services:3.1.+'
classpath 'com.android.tools.build:gradle:3.0.1'
}
}
repositories {
mavenCentral()
jcenter()
}
dependencies {
compile 'com.google.firebase:firebase-core:10.+'
}
// 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
apply plugin: com.google.gms.googleservices.GoogleServicesPlugin
platforms\android\cordova-support-google-services
buildscript {
repositories {
jcenter()
mavenCentral()
google()
}
dependencies {
classpath 'com.android.tools.build:gradle:+'
classpath 'com.google.gms:google-services:3.2.0'
classpath 'com.android.tools.build:gradle:3.0.1'
}
}
// 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
}

Answer 1

What works for me was changing the line:
apply plugin: com.google.gms.googleservices.GoogleServicesPlugin
in platforms\android\cordova-plugin-fcm-with-dependecy-updated
to this:
ext.postBuildExtras = {
apply plugin: com.google.gms.googleservices.GoogleServicesPlugin
}

Answer 2

I've had several issues with the plugin as well including the one you mention above. My problem was that my platforms/android/src/build.gradle, for some unknown reason, had duplicate dependencies (com.google.firebase:firebase-messaging & com.google.firebase:firebase-core) after removing the duplicates everything worked fine. Hope this helps!

Answer 3

I removed {phonegap-plugin-push": "2.2.3",} from my package.json.
my "package.json" was ..
{
"name": "TaxMan_v2",
"version": "0.0.1",
"author": "Ionic Framework",
"homepage": "http://ionicframework.com/",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"#angular/common": "^7.2.2",
"#angular/core": "^7.2.2",
"#angular/forms": "^7.2.2",
"#angular/http": "^7.2.2",
"#angular/platform-browser": "^7.2.2",
"#angular/platform-browser-dynamic": "^7.2.2",
"#angular/router": "^7.2.2",
"#ionic-native/core": "^5.0.0",
"#ionic-native/splash-screen": "^5.0.0",
"#ionic-native/status-bar": "^5.0.0",
"#ionic/angular": "^4.0.0",
"#ionic/storage": "^2.2.0",
"chart.js": "^2.7.3",
"cordova-android": "7.1.4",
"cordova-plugin-device": "2.0.2",
"cordova-plugin-fcm-with-dependecy-updated": "2.4.0",
"cordova-plugin-ionic-keyboard": "^2.0.5",
"cordova-plugin-ionic-webview": "^3.0.0",
"cordova-plugin-ms-azure-mobile-apps": "^2.0.2",
"cordova-plugin-splashscreen": "5.0.2",
"cordova-plugin-statusbar": "2.4.2",
"cordova-plugin-whitelist": "^1.3.3",
"cordova-support-google-services": "1.1.0",
"core-js": "^2.5.4",
"phonegap-plugin-multidex": "1.0.0",
"phonegap-plugin-push": "2.2.3",
"rxjs": "~6.3.3",
"zone.js": "~0.8.29"
},
"devDependencies": {
"#angular-devkit/architect": "~0.12.3",
"#angular-devkit/build-angular": "~0.12.3",
"#angular-devkit/core": "~7.2.3",
"#angular-devkit/schematics": "~7.2.3",
"#angular/cli": "~7.2.3",
"#angular/compiler": "~7.2.2",
"#angular/compiler-cli": "~7.2.2",
"#angular/language-service": "~7.2.2",
"#ionic/angular-toolkit": "~1.2.0",
"#types/node": "~10.12.0",
"#types/jasmine": "~2.8.8",
"#types/jasminewd2": "~2.0.3",
"codelyzer": "~4.5.0",
"jasmine-core": "~2.99.1",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~3.1.4",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "~2.0.1",
"karma-jasmine": "~1.1.2",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.4.0",
"ts-node": "~8.0.0",
"tslint": "~5.12.0",
"typescript": "~3.1.6"
},
"description": "An Ionic project",
"cordova": {
"plugins": {
"cordova-plugin-whitelist": {},
"cordova-plugin-statusbar": {},
"cordova-plugin-device": {},
"cordova-plugin-splashscreen": {},
"cordova-plugin-ionic-webview": {},
"cordova-plugin-ionic-keyboard": {},
"cordova-plugin-fcm-with-dependecy-updated": {}
},
"platforms": [
"android"
]
}
}