Can’t bind to ‘ngIf’ since it isn’t a known property of ‘div’ [duplicate]

Can’t bind to ‘ngIf’ since it isn’t a known property of ‘div’.

The element is <div [ngIf]="isAuth" id="sidebar">

And the component is:

import SessionService from '../session/session.service';
import { Component } from '@angular/core';

@Component({
  providers: [],
  selector: 'navbar-left',
  styles: [require('./navbar-left.scss')],
  template: require('./navbar-left.html'),
})
export default class NavbarLeftComponent {
  public isAuth: boolean = false;

  constructor(private sessionService: SessionService) {
    this.isAuth = sessionService.sessionIsAuth();
  }
}

Not sure what exactly I’m doing wrong? This is a child component. In the parent component aka App component the ngIf works fine.
Angular RC5