const auth0Config = {
  clientID : {MYCLIENTID},
  clientId : {MYCLIENTID},
  domain : {MYAPPDOMAIN},
  callbackURL : location.href,
  packageIdentifier : {MYIONICPACKAGENAME}
};

login(){
const client = new Auth0Cordova(auth0Config);

const options = {
  scope: 'openid profile offline_access'
};

client.authorize(options, (err, authResult) => {

  if(err){
    alert(JSON.stringify(err));
    throw err; //The error occurs around here
  }

  this.setIdToken(authResult.idToken);
  this.setAccessToken(authResult.accessToken);

  const expiresAt = JSON.stringify((authResult.expiresIn * 1000) + new Date().getTime());
  this.setStorageVariable('expires_at', expiresAt);

  this.auth0.client.userInfo(this.access_token, (err, profile) => {
    if(err) {
      throw err;
    }

    profile.user_metadata = profile.user_metadata || {};
    this.setStorageVariable('profile', JSON.stringify(profile));
    this.zone.run(() => {
      this.user = profile;
      this.logged_in = true;
    });
  });
});

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import {TabHomePage} from '../tab-home/tab-home';
import { UserServiceProvider } from '../../providers/user-service/user-service';
import { RegistrationPage } from '../registration/registration';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {

  email : string;
  password : string;

  constructor(public navCtrl: NavController, public _usp : UserServiceProvider) {

  }

  Login(){
    this._usp.login();
  }

  Go(){
    this.navCtrl.push(TabHomePage);
  }

  Logout(){
    this._usp.logout();
  }

}

<ion-content padding>

  <div text-center class="bottomize">
    <h1>MyApp</h1>
    <div *ngIf="!_usp.logged_in; else otherblock">
      <button ion-button (click)="Login()">Get Started</button>
    </div>
    <ng-template #otherblock>
      <button ion-button (click)="Go()">Go</button>
      <button ion-button (click)="Logout()">Log Out</button>
    </ng-template>
  </div>
</ion-content>