[Plugin: WordPress SEO by Yoast] Set Description with PHP

I’m adding to post meta for WPSEO with the code below

update_post_meta($post_id, '_yoast_wpseo_focuskw', '');
update_post_meta($post_id, '_yoast_wpseo_title', '');
update_post_meta($post_id, '_yoast_wpseo_metadesc', $media->group->description);
update_post_meta($post_id, '_yoast_wpseo_meta-robots-noindex', 0);
update_post_meta($post_id, '_yoast_wpseo_meta-robots-nofollow', 0);
update_post_meta($post_id, '_yoast_wpseo_meta-robots-adv', 'none');
update_post_meta($post_id, '_yoast_wpseo_sitemap-include', '-');
update_post_meta($post_id, '_yoast_wpseo_sitemap-prio', '-');
update_post_meta($post_id, '_yoast_wpseo_canonical', '');
update_post_meta($post_id, '_yoast_wpseo_redirect', '');

I get this error message in the edit post screen of wordpress

Warning: WPSEO_Metabox::do_meta_box() [wpseo-metabox.do-meta-box]: Node no longer exists in /…/wp-content/plugins/wordpress-seo/admin/class-metabox.php on line 326

The metabox does not show the description from the sql database and I’m currently at a loss of where to go from here.

ANY IDEAS?

http://wordpress.org/extend/plugins/wordpress-seo/