Ionic App Error: StaticInjectorError (AppModule) [Content - NavController]:

Personally I'm having this error that literally happens whenever I inject anything into the constructor of my MenuComponent

I made the MenuComponent and this is my app.html

<menu-component [content]="content"></menu-component>

<ion-nav #content [root]="rootPage"></ion-nav> 
<!-- Eu tenho que manter essa linha tanto aqui como no meu MenuComponent.html... Não sei porque exatamente, mas sem isso o conteúdo não é exibido -->

This is my menuComponent.html:

<ion-content>
    <ion-list>
        <button menuClose ion-item *ngFor="let page of pages" (click)="openPage(page)">
            <ion-icon name="{{page.icon}}"></ion-icon>
            {{page.title}}
        </button>
    </ion-list>
</ion-content>

This is my MenuComponent.ts:

import { Component, Input } from '@angular/core';
import { NavController } from 'ionic-angular';

/* PAGES */
import { HomePage } from '../../../pages/home/home';
import { ContactPage } from '../../../pages/contact/contact';

@Component({
    selector: 'menu-component',
    templateUrl: 'menu.component.html'
})
export class MenuComponent {

    @Input() content;

    pages: Array<{ title: string, component: any, icon: string }>;

//Não funciona
//    constructor( private navCtrl: NavController ) {

//Funciona
    constructor( ) {

        this.pages = [
            { title: 'HOME', component: HomePage, icon: 'md-home' },
            { title: 'CONTACT', component: ContactPage, icon: 'ios-chatbubbles' }
        ];

    }

    openPage(page) {
        this.navCtrl.setRoot(page.component);
    }
}

I've also tried this variation:

private navCtrl: NavController;

constructor(navCtrl: NavController) {

    this.navCtrl = navCtrl;

Finally this is my app.module:

import { BrowserModule } from '@angular/platform-browser';
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';

/* PAGES */
import { HomePage } from '../pages/home/home';
import { ContactPage } from '../pages/contact/contact';

/* COMPONENTS */
import { MenuComponent } from '../shared/components/menu/menu.component';

@NgModule({
  declarations: [
    MyApp,
    HomePage,
    ContactPage,
    MenuComponent
  ],
  imports: [
    BrowserModule,
    IonicModule.forRoot(MyApp)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    HomePage,
    ContactPage,
    MenuComponent
  ],
  providers: [
    StatusBar,
    SplashScreen,
    {provide: ErrorHandler, useClass: IonicErrorHandler}
  ]
})
export class AppModule {}

I'm still having this error:

Some help?

PS: I tried to inject a service / provider into the component. I declared it in the app.module, I imported it into the component, but when I put it in the constructor ... Pau ...