[Got error 28 from storage engine]?

Today i suddenly get this ERROR from my WP 1.5 webside (www.madzzoni.dk):

WordPress database error: [Got error 28 from storage engine]
SELECT DISTINCT * FROM wp_posts WHERE 1=1 AND post_date_gmt <= ‘2006-03-05 14:56:59’ AND (post_status = “publish” OR post_author = 1 AND post_status != ‘draft’ AND post_status != ‘static’) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 0, 10

What is this about? I haven’t edited anything.