How do I insert a post with custom post type and relate it to a custom taxonomy?
Try changing this line wp_set_object_terms( $post_id, array($cat_ids), ‘categorycourses’, false); to wp_set_object_terms( $post_id, $cat_ids, ‘categorycourses’, false); $cat_ids is already an array and you are writing with in array again. Hope it helps.