这是傻瓜

https://plnkr.co/edit/GtPDxw?p=preview

错误：

browser_adapter.ts:82 EXCEPTION: Error: Uncaught (in promise): EXCEPTION: Error in ./App class App - inline template:1:7
ORIGINAL EXCEPTION: formGroup expects a FormGroup instance. Please pass one in.
           Example: <form [formGroup]="myFormGroup">

ORIGINAL STACKTRACE:
Error: formGroup expects a FormGroup instance. Please pass one in.
           Example: <form [formGroup]="myFormGroup">

    at new BaseException (https://npmcdn.com/@angular/forms@0.2.0/src/facade/exceptions.js:27:23)
    at FormGroupDirective._checkFormPresent (https://npmcdn.com/@angular/forms@0.2.0/src/directives/reactive_directives/form_group_directive.js:110:19)
    at FormGroupDirective.ngOnChanges (https://npmcdn.com/@angular/forms@0.2.0/src/directives/reactive_directives/form_group_directive.js:39:14)
    at DebugAppView._View_App0.detectChangesInter

>< div [formGroup] =“form”>在< form>之外标签
>< form [formGroup] =“form”>但是包含FormGroup的属性的名称是loginForm,因此它应该是< form [formGroup] =“loginForm”>
> [formControlName] =“dob”,它传递不存在的属性dob的值.你需要的是传递字符串dob,如[formControlName] =“’dob’”或更简单的formControlName =“dob”

Plunker example

我想在我的Ionic 2应用程序中创建一个非常简单的登录表单.

无论我尝试什么,我都会收到这个错误：

formGroup expects a FormGroup instance. Please pass one in.

代码：

页面组件：

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { FormGroup,Validators,FormBuilder }  from '@angular/forms';

@Component({
  selector: 'login-page',templateUrl: 'login-page.html'
})

export class LoginPage {

    loginForm: FormGroup;

    constructor(public navCtrl: NavController,private formBuilder: FormBuilder) {}

    ionViewDidLoad() 
    {
        console.log('Login page loaded');

        this.loginForm = this.formBuilder.group({
            email: ['',Validators.required],password: ['',});
    }

    submitLogin() 
    {
        console.log('Doing login..');
    }

}

风景：

<ion-header>
  <ion-navbar>
    <ion-title>LoginPage</ion-title>
  </ion-navbar>
</ion-header>

<ion-content padding>

    <form [formGroup]="loginForm" (ngSubmit)="submitLogin()">

    <ion-item>
        <ion-label>Email</ion-label>
        <ion-input #email type="email" formControlName="email"></ion-input>
    </ion-item>

    <ion-item>
        <ion-label>Password</ion-label>
        <ion-input #password type="text" formControlName="password"></ion-input>
    </ion-item>

    <button ion-button block type="submit">Submit</button>

    </form>

</ion-content>

问题：

你为什么我得到错误？

你知道那段代码有什么问题吗？

谢谢！