Error: can't render field data in the current format. You can try "Get child value" callback. Available children: ID, post_author, post_date, post_date_gmt, post_content, post_title, post_excerpt, post_status, comment_status, ping_status, post_password, post_name, to_ping, pinged, post_modified, post_modified_gmt, post_content_filtered, post_parent, guid, menu_order, post_type, post_mime_type, comment_count, filter. Or one of array-related callbacks - "Multiple select field values", "Checkbox field values", "Checked values list" etc