title: There is no directive with "exportAs" set to "bs-modal"
body: <p>I would like to integrate child modal into my project following example at </p>
  
  <pre><code>https://valor-software.com/ng2-bootstrap/#/modals#static
  </code></pre>
  
  <p>but I got an exception showing as below:</p>
  
  <p>There is no directive with "exportAs" set to "bs-modal". I searched on google and found an answer at this link but it didn't work.</p>
  
  <pre><code>https://github.com/valor-software/ng2-bootstrap/issues/667#issuecomment-235204534 
  </code></pre>
  
  <p>This line doesn't work when I followed his solution:</p>
  
  <p>import {MODAL_DIRECTIVES, BS_VIEW_PROVIDERS,ModalDirective} from 'ng2-bootstrap/ng2-bootstrap';</p>
  
  <p>Anybody can help? Thanks.
  My project is using:</p>
  
  <pre><code> "ng2-bootstrap": "^1.2.4"
   "@angular/common": "2.4.3",
   "@angular/compiler": "2.4.3",
   "@angular/core": "2.4.3",
   "@angular/forms": "2.4.3",
   "@angular/http": "2.4.3",
  </code></pre>