the Firebase plugin is not installed - ionic 3 - xcode

Question

this is the message I read in the console :
the Firebase plugin is not installed when trying to run my project on a device on Xcode.
I have recently downgraded to Firebase 4.8.0 for dependencies compatibility issues.
I made sure to add my GoogleService-info.plist to the root of my ionic project and to the Xcode project.
I checked my node_modules: #ionic-native/firebase. everything is there
There is no error. The app runs properly, excepts that the Firebase plugin does not seem to be found.
I have tried to uninstall et re-install. no success
What to do in this case?
this is my package.json:
{
"name": "authNotificationTest",
"version": "0.0.1",
"author": "Ionic Framework",
"homepage": "http://ionicframework.com/",
"private": true,
"scripts": {
"clean": "ionic-app-scripts clean",
"build": "ionic-app-scripts build",
"lint": "ionic-app-scripts lint",
"ionic:build": "ionic-app-scripts build",
"ionic:serve": "ionic-app-scripts serve"
},
"dependencies": {
"#angular/animations": "5.2.10",
"#angular/common": "5.2.10",
"#angular/compiler": "5.2.10",
"#angular/compiler-cli": "5.2.10",
"#angular/core": "5.2.10",
"#angular/forms": "5.2.10",
"#angular/http": "5.2.10",
"#angular/platform-browser": "5.2.10",
"#angular/platform-browser-dynamic": "5.2.10",
"#ionic-native/core": "4.7.0",
"#ionic-native/fcm": "^4.7.0",
"#ionic-native/firebase": "^4.7.0",
"#ionic-native/splash-screen": "4.7.0",
"#ionic-native/status-bar": "4.7.0",
"#ionic/storage": "2.1.3",
"angularfire2": "5.0.0-rc.3",
"cordova-browser": "5.0.3",
"cordova-ios": "4.5.4",
"cordova-plugin-device": "^2.0.2",
"cordova-plugin-fcm": "^2.1.2",
"cordova-plugin-fcm-plus": "git+https://github.com/guyromb/cordova-plugin-fcm-plus.git",
"cordova-plugin-firebase": "^1.0.2",
"cordova-plugin-ionic-keyboard": "^2.0.5",
"cordova-plugin-ionic-webview": "^1.2.1",
"cordova-plugin-splashscreen": "^5.0.2",
"cordova-plugin-whitelist": "^1.3.3",
"firebase": "^4.8.0",
"ionic-angular": "3.9.2",
"ionicons": "3.0.0",
"rxjs": "5.5.10",
"sw-toolbox": "3.6.0",
"zone.js": "0.8.26"
},
"devDependencies": {
"#ionic/app-scripts": "3.1.9",
"typescript": "~2.6.2"
},
"description": "An Ionic project",
"cordova": {
"plugins": {
"cordova-plugin-fcm": {},
"cordova-plugin-firebase": {},
"cordova-plugin-whitelist": {},
"cordova-plugin-device": {},
"cordova-plugin-splashscreen": {},
"cordova-plugin-ionic-webview": {},
"cordova-plugin-ionic-keyboard": {}
}
}
}
and, my ionic info:
li packages: (/usr/local/lib/node_modules)
#ionic/cli-utils : 1.19.2
ionic (Ionic CLI) : 3.20.0
global packages:
cordova (Cordova CLI) : 8.0.0
local packages:
#ionic/app-scripts : 3.1.9
Cordova Platforms : browser 5.0.3 ios 4.5.4
Ionic Framework : ionic-angular 3.9.2
System:
Node : v9.11.1
npm : 6.0.0
OS : macOS High Sierra
Xcode : Xcode 9.3 Build version 9E145
Environment Variables:
ANDROID_HOME : not set
Misc:
backend : pro

Answer 1

Try to run:-
ionic cordova plugin add cordova-plugin-firebase
npm install --save #ionic-native/firebase
For more info visit:- https://ionicframework.com/docs/native/firebase/