Causes 500 when publishing post

  • something related to FB IA plugin, perhaps:
    [13-Sep-2016 19:57:27 UTC] PHP Fatal error: Uncaught exception ‘ReflectionException’ with message ‘Class Facebook\InstantArticles\Transformer\Rules\InteractiveInsideParagraphRule does not exist’ in /wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Transformer.php:224

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