Since I use WP 1.2 or so I have never had the singled problem after automated upgrade. Yesterday I switched to 3.1.2 and while posting I tried to put an image in the post and had this
Fatal error: Call to undefined function get_post_thumbnail_id() in /-/-/-/-/public_html/000-eucmh.com/wp-admin/includes/media.php on line 1314
Can anyone help me ?
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