StaticInjectorError(Platform: core)[l -> n]: NullInjectorError: No provider for n!

[haihuo0910]

Ionic:

ionic (Ionic CLI) : 4.9.0 (C:\Users\lyh\AppData\Roaming\npm\node_modules\ionic)
Ionic Framework : @ionic/angular 4.0.0
@angular-devkit/build-angular : 0.12.3
@angular-devkit/schematics : 7.2.3
@angular/cli : 7.2.3
@ionic/angular-toolkit : 1.2.3

Cordova:

cordova (Cordova CLI) : 8.1.2 ([email protected])
Cordova Platforms : android 7.1.4
Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 3.1.2, (and 6 other plugins)

System:

NodeJS : v10.15.0 (E:\Program Files\nodejs\node.exe)
npm : 6.4.1
OS : Windows 8.1

开始的时候没有问题，
安装：
screen-orientation
实例化：
constructor(
public router: Router,
public activeRoute: ActivatedRoute,
private http: HttpService,
private modalCtrl: ModalController,
private navParams: NavParams,
private screenOrientation: ScreenOrientation,
private platform: Platform
) {
// this.cid = navParams.get('cid');
}

之后就报这个错误了，哪位知道是什么原因？

[cnkker]

add ScreenOrientation providers at app.module.ts