Ionic 3 : npm install admob-free UNMEET PEER DEPENDENCIES - ionic-framework

Question

Ionic 3 : npm install admob-free UNMEET PEER DEPENDENCIES.
I cannot import the AdmobFree Library to the Ionic 3 project. It show error when i do npm install.
When I type :
npm install --save #ionic-native/admob-free
it show :
+-- #ionic-native/admob-free#4.5.2
`-- UNMET PEER DEPENDENCY #ionic-native/core#4.4.0
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents#^1.0.0 (node_modules\chokidar\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents#1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN #ionic-native/admob#3.14.0 requires a peer of #ionic-native/core#^3.6.0 but none was installed.
for more detal, this is my package.json :
{
"name": "AcehTourismMap",
"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/common": "5.0.3",
"#angular/compiler": "5.0.3",
"#angular/compiler-cli": "5.0.3",
"#angular/core": "5.0.3",
"#angular/forms": "5.0.3",
"#angular/http": "5.0.3",
"#angular/platform-browser": "5.0.3",
"#angular/platform-browser-dynamic": "5.0.3",
"#ionic-native/admob": "^3.14.0",
"#ionic-native/admob-free": "^4.5.2",
"#ionic-native/core": "^4.4.0",
"#ionic-native/launch-navigator": "^4.5.2",
"#ionic-native/splash-screen": "4.4.0",
"#ionic-native/status-bar": "^4.4.0",
"#ionic/storage": "2.1.3",
"cordova-admob-sdk": "^0.13.1",
"cordova-android": "~7.0.0",
"cordova-plugin-actionsheet": "^2.3.3",
"cordova-plugin-admob-free": "^0.13.0",
"cordova-plugin-device": "^1.1.4",
"cordova-plugin-dialogs": "^2.0.1",
"cordova-plugin-ionic-webview": "^1.1.16",
"cordova-plugin-splashscreen": "^4.0.3",
"cordova-plugin-statusbar": "^2.4.1",
"cordova-plugin-whitelist": "^1.3.1",
"cordova-promise-polyfill": "0.0.2",
"ionic-angular": "3.9.2",
"ionic-plugin-keyboard": "^2.2.1",
"ionicons": "3.0.0",
"rxjs": "5.5.2",
"sw-toolbox": "3.6.0",
"uk.co.workingedge.phonegap.plugin.launchnavigator": "^4.1.3",
"zone.js": "0.8.18"
},
"devDependencies": {
"#ionic/app-scripts": "3.1.6",
"typescript": "2.4.2"
},
"description": "An Ionic project",
"cordova": {
"plugins": {
"ionic-plugin-keyboard": {},
"cordova-plugin-whitelist": {},
"cordova-plugin-device": {},
"cordova-plugin-splashscreen": {},
"cordova-plugin-ionic-webview": {},
"cordova-plugin-statusbar": {},
"uk.co.workingedge.phonegap.plugin.launchnavigator": {},
"cordova-plugin-admob-free": {}
},
"platforms": [
"android"
]
}
}
How to fix this? The plugin/library not downloaded, and I cannot import the AdmobFree library
import { AdMobFree } from '#ionic-native/admob-free';
Thank you for the answer, I really appreciate, thank you......