Ionic 3 angular 5 - can't resolve all parameter for "page"

Question

got an error "Can't resolve all parameters for HomePage: ([object Object], ?, [object Object], [object Object])" . I am trying to reach my database with angularfire - users email on toastcontroller messeges when they login. Function name : "IonViewWillLoad()"

All project : https://github.com/AndriusdevLa/test

Thats my HomePage :

import { Component } from '@angular/core';
import { NavController, ModalController } from 'ionic-angular';
import { DetailPage } from '../detail/detail';
import { ToastController } from 'toast-controller';
import { AngularFireAuth } from "angularfire2/auth";
import { User } from '../../app/modals/user';
@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
//public shouldReorder = false;
  user = {} as User;

  constructor(private aFAuth: AngularFireAuth,
              private toastCtrl = ToastController,
    public navCtrl: NavController,
              public modalCtrl: ModalController)
  {
    //this.service.getPeople().subscribe( data => {
  //    this.people = data.results
  //  });


  }


  ionViewWillLoad(){
    this.aFAuth.authState.subscribe(data => {
      if(data.email && data.uid) {
        let toast = this.toastCtrl.create({
          message: 'User was added successfully',
          duration: 3000,
          position: 'top'
        });

        toast.onDidDismiss(() => {
          console.log('Dismissed toast');
        });
        toast.present();
      }

      else {
        let toast = this.toastCtrl.create({
          message: 'User not found',
          duration: 3000,
          position: 'top'
        });
        toast.present();
      }
    });
  }
}

I dont understand what is that error about, maby someone could tell me ? There are no more errors in IDE, only this one in browser (ionic serve).

App.module.ts :

import { BrowserModule } from '@angular/platform-browser';
import { HttpClient, HttpClientModule } from "@angular/common/http";
import { ErrorHandler, NgModule } from '@angular/core';
import { IonicApp, IonicErrorHandler, IonicModule } from 'ionic-angular';
import { SplashScreen } from '@ionic-native/splash-screen';
import { StatusBar } from '@ionic-native/status-bar';
import { MyApp } from './app.component';
import { HomePage } from '../pages/home/home';
import { DetailPage } from '../pages/detail/detail';
import { StartPage } from '../pages/start/start';
import { AngularFireModule } from "angularfire2";
import { FIREBASE_CONFIG } from "./app.firebase.config";
import { LoginPage } from "../pages/login/login";
import { AngularFireAuthModule } from "angularfire2/auth";


@NgModule({
  declarations: [
    MyApp,
    StartPage,
    HomePage,
    DetailPage,
    LoginPage,


  ],
  imports: [
    BrowserModule,
    HttpClientModule,
    IonicModule.forRoot(MyApp),
    AngularFireModule.initializeApp(FIREBASE_CONFIG),
    AngularFireAuthModule
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    StartPage,
    HomePage,
    DetailPage,
    LoginPage,
  ],
  providers: [
    HttpClient,
    StatusBar,
    SplashScreen,
    {provide: ErrorHandler, useClass: IonicErrorHandler},

  ]
})
export class AppModule {}

User.ts :

export interface User {
  email: string;
  password: string;

}

Edit :

When I deleted - public navCtrl: NavController, from my constructor (it wasnt used, the error became smaller, but a little bit different = ?) :

Can't resolve all parameters for HomePage: ([object Object], ?, [object Object])

Answer 1

The error is because angular can't access all the parameters required for the HomePage. In your constructor, you've declared four parameters angular cannot access everything except that ToastController. That is why the parameter in your error message is a question mark.

You have to import ToastController properly from ionic-angular, right now you are importing it from 'toast-controller' unless you have something in that location you need to remove the line

import { ToastController } from 'toast-controller';

Then import ToastController properly from ionic-angular library.like this (change second line of your code)

import { NavController, ModalController, ToastController } from 'ionic-angular';