title: Cannot read property 'errors' of undefined in angular 2
body: <p>I am validating my template using angular2, but meanwhile it shows this error:</p>
  
  <pre><code> Cannot read the property 'errors' of undefined. 
  </code></pre>
  
  <p>Here is my template:</p>
  
  <pre><code>&lt;h3 class = "head"&gt;{{title}}&lt;/h3&gt;
  &lt;form  [ngFormModel]="form" #f="ngForm"&gt;
    &lt;div class="row"&gt;
      &lt;div class="form-group"&gt;     
        &lt;label class="formHeading"&gt;Facebook&lt;/label&gt;
        &lt;input type="text" id="facebook" class="form-control col-xs-3"  ngControl="facebook" #facebook="ngForm" &gt;  
      &lt;/div&gt;
      &lt;div *ngIf ="facebook.touched  &amp;&amp; facebok.errors"&gt;  
        &lt;div class="form-row btn"&gt;
        &lt;button type="submit" class="btn btn-primary pull-right butspace" [disabled]="!f.valid"&gt;Save&lt;/button&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>I dont know why it shows this error. Can anyone fix it?</p>