[Plugin: Google XML Sitemaps] new error in logs –

Since upgrading to version 3.1.8 I started seeing the following error in my error logs. The Sitemap still seems to be generating properly, but I’m concerned about the error. I’m running WP 2.8.5 if that helps.

[08-Nov-2009 07:52:41] WordPress database error Unknown column ‘p.user_nicename’ in ‘field list’ for query SELECT DISTINCT
p.ID,
p.user_nicename,
MAX(p.post_modified_gmt) AS last_post
FROM
wp_users u,
wp_posts p
WHERE
p.post_author = u.ID
AND p.post_status = ‘publish’
AND p.post_type = ‘post’
AND p.post_password = ”
GROUP BY
u.ID,
u.user_nicename made by do_action_ref_array, call_user_func_array, GoogleSitemapGeneratorLoader->CallBuildSitemap, GoogleSitemapGenerator->BuildSitemap