angular2 - Forms - Cannot set property 'stack' of undefined

Question

When Creating my first form in Angular2, I get this following Error:

Unhandled Promise rejection: Cannot set property 'stack' of undefined ; Zone: ; Task: Promise.then ; Value: TypeError: Cannot set property 'stack' of undefined

I am using anguilar-cli 1.0.0-beta.25.5. ** here is my code:

import { Component } from '@angular/core';
import {FormControl, FormGroup} from '@angular/forms';

@Component({
  selector: 'app-root',
  template:
    `<div class="container">
           <form [formGroup]="userForm" (ngSubmit)="submitHandler()">
             <div class="form-group">
                <input type="text" class="form-control"       formControlName="username"
  placeholder="username...">
            </div>
          </form>
     </div>`
})
export class AppComponent {
  private userForm : FormGroup;

  constructor(){
    this.userForm = new FormGroup({
      username : new FormControl(),
      password : new FormControl(),
      email : new FormControl(),
    });

  }
}

Answer 1

Update zone.js to 0.7.6 and you'll see actual error.

Answer 2

It might be related to the issue here. https://github.com/angular/angular-cli/issues/3975 . Do backup and try to update to the latest version.