Facebook Instant Articles - CONTENT NOT MATCHED

I'm trying to publish test article by Facebook Instant Articles PHP SDK:

$the_html = '<!doctype html>
<html lang="en" prefix="op: http://media.facebook.com/op#">
<head>
  <meta charset="utf-8">
  <meta property="op:markup_version" content="v1.0">
  <link rel="canonical" href="http://myarticle">
  <meta property="fb:article_style" content="default">
</head>
<body>
  <article>
    <header>
      <h1> test title</h1>
      <h2> test subtitle </h2>

       <time class="op-published" dateTime="2016-06-20T08:00">June 17th 2016, 8:00 AM</time>
      <time class="op-modified" dateTime="2016-06-20T08:00">June 17th 2016, 8:00 AM</time>

      <p> Test test test </p>
    </header>
  </article>
</body>
</html>';

 $fb = Client::create(
    'APP_ID'
    'APP_SECRET',
    'ACCESS_TOKEN',
    'PAGE_ID',
     true //development env
 );

$instant_article = InstantArticle::create();
$transformer = new Transformer();
libxml_use_internal_errors(true);
$document = new \DOMDocument();
$document->loadHTML($the_html);
libxml_use_internal_errors(false);

$transformer->transform($instant_article, $document);

$fb->importArticle($instant_article, true);

I'm getting this message:

DEBUG - =========================== DEBUG - =========================== DEBUG - context class: Facebook\InstantArticles\Elements\InstantArticle DEBUG - node name: html DEBUG - CONTENT NOT MATCHED:

I was able to publish article by using Instant Articles API in Graph API Explorer, but can't make it work with PHP.

Any help would be greatly appreciated.

Solution

You should add file with rules and load it. File example.

$rules = file_get_contents("instantArticlesModule/simple-rules.json", true);
$transformer = new Transformer();
$transformer->loadRules($rules);