title: ngModel is used within a form on Ionic 3
body: <p>By clicking the <code>Register</code> button on my login page, I'm redirected to the following page.</p>
  
  <p>Where it says the following error</p>
  
  <p>And this is my <code>login.html</code></p>
  
  <pre><code>&lt;ion-content padding class="loginPage"&gt;
    &lt;div class="spacer"&gt;&lt;/div&gt;
      &lt;img src="../../assets/icon/iconLoginPage.png" class="loginImage"/&gt;
    &lt;div class="spacer"&gt;&lt;/div&gt;
    &lt;ion-list&gt;
      &lt;ion-item class="loginButton"&gt;
        &lt;ion-input placeholder="E-mail" type="text" [(ngModel)]="user.email"&gt;&lt;/ion-input&gt;
      &lt;/ion-item&gt;
      &lt;ion-item class="loginButton"&gt;
        &lt;ion-input placeholder="Senha" type="password" [(ngModel)]="user.password"&gt;&lt;/ion-input&gt;
      &lt;/ion-item&gt;
      &lt;ion-grid&gt;
        &lt;ion-row&gt;
          &lt;ion-col&gt;
            &lt;button ion-button full color="royal" (click)="login(user)"&gt;Login&lt;/button&gt;
          &lt;/ion-col&gt;
          &lt;ion-col&gt;
            &lt;button ion-button full color="light" (click)="register()"&gt;Cadastrar&lt;/button&gt;
          &lt;/ion-col&gt;
        &lt;/ion-row&gt;
      &lt;/ion-grid&gt;
    &lt;/ion-list&gt;
  &lt;/ion-content&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/s6cw8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/s6cw8.png" alt="Image error"></a></p>