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with the last update of the plugin Instant Articles for WP on October 18 I have this error for each new note
Fatal error: Uncaught Error: Class ‘Facebook\InstantArticles\Transformer\Transformer’ not found in /nas/content/live/ultimasnoticia/wp-content/plugins/fb-instant-articles/class-instant-articles-post.php:613 Stack trace: #0 /nas/content/live/ultimasnoticia/wp-content/plugins/fb-instant-articles/class-instant-articles-post.php(874): Instant_Articles_Post->to_instant_article() #1 /nas/content/live/ultimasnoticia/wp-content/plugins/fb-instant-articles/class-instant-articles-post.php(951): Instant_Articles_Post->is_empty_after_transformation() #2 /nas/content/live/ultimasnoticia/wp-content/plugins/fb-instant-articles/facebook-instant-articles.php(357): Instant_Articles_Post->should_submit_post() #3 /nas/content/live/ultimasnoticia/wp-includes/class-wp-hook.php(307): inject_ia_markup_meta_tag(”) #4 /nas/content/live/ultimasnoticia/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array) #5 /nas/content/live/ultimasnoticia/wp-includes/plugin.php(476): WP_Hook->do_action(Array) #6 /nas/content/live/ultimasnoticia/ in /nas/content/live/ultimasnoticia/wp-content/plugins/fb-instant-articles/class-instant-articles-post.php on line 613