CUSTOM_ELEMENTS_SCHEMA added to NgModule.schemas still showing Error
<p>I just upgraded from Angular 2 rc4 to rc6 and having troubles doing so. </p>

<p>I see the following error on my console: </p>

<pre><code>Unhandled Promise rejection: Template parse errors:
'cl-header' is not a known element:
1. If 'cl-header' is an Angular component, then verify that it is part of this module.
2. If 'cl-header' is a Web Component then add "CUSTOM_ELEMENTS_SCHEMA" to the '@NgModule.schema' of this component to suppress this message. ("&lt;main&gt;
    [ERROR -&gt;]&lt;cl-header&gt;Loading Header...&lt;/cl-header&gt;
    &lt;div class="container-fluid"&gt;
      &lt;cl-feedbackcontai"): AppComponent@1:4
</code></pre>

<p>Here is my Header Component:</p>

<pre><code>import { Component } from '@angular/core';
import { Router } from '@angular/router';

// own service
import { AuthenticationService } from '../../../services/authentication/authentication.service.ts';

import '../../../../../public/css/styles.css';

@Component({
  selector: 'cl-header',
  templateUrl: './header.component.html',
  styleUrls: ['./header.component.css']
})
export class HeaderComponent { // more code here... }
</code></pre>

<p>Here is my Header Module: </p>

<pre><code>import { NgModule, CUSTOM_ELEMENTS_SCHEMA }      from '@angular/core';
import { RouterModule } from '@angular/router';
import { CommonModule }      from '@angular/common';
import { FormsModule }      from '@angular/forms';

import { HeaderComponent }  from './../../../components/util_components/header/header.component.ts';

@NgModule({
    declarations: [ HeaderComponent ],
    bootstrap:    [ HeaderComponent ],
    imports: [ RouterModule, CommonModule, FormsModule ],
    schemas: [ CUSTOM_ELEMENTS_SCHEMA ]
})
export class HeaderModule { }
</code></pre>

<p>I created a wrapper module called util module which imports the HeaderModule:</p>

<pre><code>import { NgModule }      from '@angular/core';

import {HeaderModule} from "./header/header.module";
// ...

@NgModule({
    declarations: [ ],
    bootstrap:    [ ],
    imports: [ HeaderModule]
})
export class UtilModule { }
</code></pre>

<p>Which is finally imported by the AppModule: </p>

<pre><code>import { NgModule }      from '@angular/core';

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

import { AppComponent }  from './app.component';

import {UtilModule} from "./modules/util_modules/util.module";
import {RoutingModule} from "./modules/routing_modules/routing.module";

@NgModule({
    bootstrap: [AppComponent],
    declarations: [AppComponent],
    imports: [BrowserModule, UtilModule, RoutingModule]
})
export class AppModule { }
</code></pre>

<p>To my understanding I am following the instructions of the error message using the SCHEMA to surpress the error. But it seems not to work. 
What am I doing wrong? 
(I hope its nothing obvious I just don't see at the moment. Been spending the past 6 hours upgrading to this version...)</p>