Code=1001 "No fill" error in Facebook Audience Network
<p>I am integrating Facebook audience network in my iOS project for the first time. Every thing is as perfect as described in the official documentation.</p>

<p>But still I am getting this error every time I run the app.</p>

<blockquote>
  <p>Error Domain=com.facebook.ads.sdk Code=1001 "No fill"
  UserInfo={NSLocalizedDescription=No fill, FBAdErrorDetailKey={
      msg = "No fill"</p>
</blockquote>

<p>I am doing my project in swift btw. and this is the site I have followed for audience network integration:
<a href="https://www.appcoda.com/facebook-ads-integration/" rel="nofollow">https://www.appcoda.com/facebook-ads-integration/</a></p>

<p>Please help me out of this. Thanks.</p>