问无法绑定到“ngModel”，因为它不是“输入”的已知属性？

zone.js:461 Unhandled Promise rejection: Template parse errors:

Can't bind to 'ngModel' since it isn't a known property of 'input'. ("

    <div>

        <label>Created:</label>

        <input  type="text" [ERROR ->][(ngModel)]="test" placeholder="foo" />

    </div>

</div>"): InterventionDetails@4:28 ; Zone: <root> ; Task: Promise.then ; Value: 

我正在看Hero plucker，但是我没有看到任何区别。

这是组件文件：

import { Component, EventEmitter, Input, OnInit, Output } from '@angular/core';

import { Intervention } from '../../model/intervention';

@Component({

    selector: 'intervention-details',

    templateUrl: 'app/intervention/details/intervention.details.html',

    styleUrls: ['app/intervention/details/intervention.details.css']

})

export class InterventionDetails

{

    @Input() intervention: Intervention;

    public test : string = "toto";

}